Best picks

9 Best Delta Dual Shower Heads With Slide Bars (November 2026)

Updated on · By the Homemize team

The best Delta dual shower heads with slide bars include the UCLIMAA High Pressure 48-Settings Shower Head for adjustable height for the whole family, the egretshower 7.5" Rotatable Dual Shower Head for kids and low-reach switching, and the BRIGHT SHOWERS Rain Shower Head with Handheld for low water pressure homes.

On this page (8 sections)
  1. The best dual shower heads with slide bars for each bathroom
  2. How these dual shower heads compare
  3. How we compared these shower heads
  4. What should you measure before buying a dual shower head with a slide bar?
  5. Which bar type suits your bathroom?
  6. Does a longer slide bar always mean a better shower?
  7. What else changes daily use on a dual shower head?
  8. Which dual shower head with a slide bar should you buy?

The best dual shower head with a slide bar for most bathrooms is the UCLIMAA High Pressure 48-Settings Shower Head, a drill-free combo that lets you move the hand shower from tall-adult height down to child or seated-bather height. If you want real Delta parts, the Delta HydroRain 2-in-1 is the top Delta dual shower head with slide bar option, though you'll add the bar yourself.

A slide bar changes how a dual shower head works in daily life. Instead of a fixed bracket at one height, the hand shower glides up and down, so one bathroom serves a 6 ft 4 in adult and a 7-year-old without a step stool.

That adjustability is the reason to pay more for a combo with a bar rather than a fixed docking head.

Our picks at a glance

  1. 1 UCLIMAA High Pressure 48-Settings Shower Head
    Best for adjustable height for the whole family

    UCLIMAA High Pressure 48-Settings Shower Head

    9.7/10 our score

    See it on Amazon
  2. 2 egretshower 7.5" Rotatable Dual Shower Head
    Best for kids and low-reach switching

    egretshower 7.5" Rotatable Dual Shower Head

    9.3/10 our score

    See it on Amazon
  3. 3 BRIGHT SHOWERS Rain Shower Head with Handheld
    Best for low water pressure homes

    BRIGHT SHOWERS Rain Shower Head with Handheld

    8.9/10 our score

    See it on Amazon
  1. 4Delta 5-Setting HydroRain 2-in-1 Dual Shower Head

    Delta 5-Setting HydroRain 2-in-1 Dual Shower Head

    Best for quick upgrades on an existing arm
    Check it
  2. 5Delta In2ition 6-setting 2-in-1 shower head with handheld

    Delta In2ition 6-setting 2-in-1 shower head with handheld

    Best for more spray choices in a Delta head
    Check it
  3. 6BRIGHT SHOWERS slide bar shower set with handheld

    BRIGHT SHOWERS slide bar shower set with handheld

    Best for grab-bar safety in the shower
    Check it
  4. 7Delta 9-spray slide bar handheld, chrome

    Delta 9-spray slide bar handheld, chrome

    Best for Delta build quality with a slide bar
    Check it
  5. 8Rain and handheld combo with 27.5-inch slide barCheck it
  6. 93-way rain and handheld combo with adjustable slide barCheck it

The best dual shower heads with slide bars for each bathroom

Every pick here pairs two shower heads with some way to change hand shower height. The best pick overall is UCLIMAA for its full kit and family-friendly bar, while the rest win on bar length, safety support or genuine Delta build.

1

UCLIMAA High Pressure 48-Settings Shower Head: Best for adjustable height for the whole family

UCLIMAA High Pressure 48-Settings Shower Head, Delta dual shower heads with slide bars
9.7/10Our score
  • Two 5 in heads with 7 settings each
  • Drill-free 304 stainless slide bar
  • Low 3-way diverter
  • Brushed nickel finish

A dual-head combo with a height-adjustable bar that installs without drilling. Both heads share seven spray settings and the diverter sits low for easy reach.

See it on Amazon

Pros

  • Bar adjusts for tall, short and seated users
  • 48 total spray settings
  • Drill-free install with permanent-anchor option

Cons

  • Needs 28 in of clear vertical wall
  • No Delta warranty

UCLIMAA earns the top spot because it solves the whole job in one box. The kit includes two 5 in heads, a drill-free 304 stainless bar, a hose and a low 3-way diverter, so the hand shower slides to any height and the mode switch sits within easy reach of kids and seated bathers.

Both heads carry the same seven settings, from massage to rain and a water-saving mode, so the overhead and handheld spray feel consistent. The bar mounts with adhesive or wall anchors, but the install needs 28 in of clear vertical wall between the shower arm and the mixer valves.

The stainless bar resists rust and the whole system meets US compliance standards, which matters in a wet room. At 1.81 kg the kit stays light enough to handle during install without help.

The trade-off is that this is not a Delta product and carries no Delta warranty. Choose it when adjustable height and a complete kit matter more than the brand name.

If you only need the bar and hand shower half of this setup, see our handheld shower head with slide bar guide.

UCLIMAA High Pressure 48-Settings Shower HeadCheck it on Amazon
2

egretshower 7.5" Rotatable Dual Shower Head: Best for kids and low-reach switching

egretshower 7.5" Rotatable Dual Shower Head, Delta dual shower heads with slide bars
9.3/10Our score
  • 7.48 in rain head plus 4.7 in hand shower
  • Low 3-way diverter
  • Height-adjustable slide bar
  • Super power jet cleaning mode

A wide rain head with a low diverter that children and seated bathers can reach. The hand shower slides up and down the bar to change height.

See it on Amazon

Pros

  • Large 7.48 in rain head
  • Diverter placed low for easy reach
  • Self-cleaning silicone nozzles

Cons

  • Bar is shorter than some rivals
  • Polished chrome only

egretshower suits a household with young kids or a family member who showers seated. The 3-way diverter sits low on the wall, so switching between the rain head, hand shower or both takes little reach.

Its 7.48 in rain head is the widest here and its angle pivots away from the wall to spread water over more of your body. The hand shower adds a super power jet mode that rinses tubs, tiles and pets in seconds.

The slide bar changes hand shower height for different users, and the silicone nozzles rub clean of lime with a thumb. The ABS body resists rust and scratches and shrugs off hot and cold swings.

The kit includes a 6 ft shower arm with flange and a steel hose.

Against the top pick, the bar is shorter and the only finish is polished chrome. Note that the kit's bar length and its listed head size are two separate numbers to check before ordering.

Pick it when reach matters more than bar travel. The extra spray modes and the wide rain head are the real draw.

egretshower 7.5" Rotatable Dual Shower HeadCheck it on Amazon
3

BRIGHT SHOWERS Rain Shower Head with Handheld: Best for low water pressure homes

BRIGHT SHOWERS Rain Shower Head with Handheld, Delta dual shower heads with slide bars
8.9/10Our score
  • 6 in rain head plus 9-mode hand shower
  • Brass slide bar and diverter
  • 80+ self-cleaning nozzles
  • 60 in stainless hose

A brass-bar system built for steady flow in low pressure homes. The overhead arm moves left and right, and the hand shower adds a power-wash mode.

See it on Amazon

Pros

  • Brass slide bar and diverter
  • Rain arm shifts left and right
  • Power Wash cleaning mode

Cons

  • Hand shower has no height change on the bar beyond the bracket
  • Single handle for mode switching

BRIGHT SHOWERS wins for homes with weak water pressure. The 6 in rain head uses 80+ self-cleaning silicone nozzles to keep flow even when the supply is low, and the overhead arm shifts left and right to center the spray where you stand.

Its brass slide bar and diverter are sturdier than plastic rivals, and the 9-mode hand shower includes a Power Wash setting for cleaning the tub. A 60 in stainless hose gives reach without kinking.

The hose fitting rotates 360 degrees so the line stays untwisted while you move the head.

The height adjustment is real, but the hand shower bracket is the part that moves, and the overhead head stays fixed on its arm. One handle controls the diverter, so there's no second lever to learn.

The kit supports drill-free adhesive or screw installation. Compare this with a full rain shower head with handheld setup if you want a wider rain head.

Choose it when pressure is the problem. The brass parts and cleaning spray make it the practical pick for older plumbing.

BRIGHT SHOWERS Rain Shower Head with HandheldCheck it on Amazon
4

Delta 5-Setting HydroRain 2-in-1 Dual Shower Head: Best for quick upgrades on an existing arm

Delta 5-Setting HydroRain 2-in-1 Dual Shower Head, Delta dual shower heads with slide bars
8.6/10Our score
  • 2-in-1 head with detachable hand shower
  • ProClean high-pressure spray
  • Pivoting raincan
  • Matte black finish

A single head that docks a hand shower in its center. The raincan pivots and the ProClean spray handles tile and tub cleaning.

See it on Amazon

Pros

  • ProClean spray cleans faster than standard sprays
  • Both heads can run together
  • Salt-fog tested matte black finish

Cons

  • Needs a separate slide bar for height adjustment
  • Shower arm sold separately

The Delta HydroRain is the simplest way to get a genuine Delta dual head. Its hand shower docks in the center of the head and can be lifted out on its hose, and the pivoting raincan tilts to aim the spray.

ProClean is the standout feature: Delta says the focused fan spray cleans tile and hard-to-reach spots at least twice as fast as standard sprays. The 5 settings cover full body, massage, shampoo rinse and pause.

Touch-Clean holes wipe free of calcium and lime with a finger, so you skip soaking and chemical cleaners.

The catch is height. This is a head only, so the hand shower returns to the dock at one fixed spot unless you buy a Delta slide bar.

The matte black finish is salt-fog tested for over 12 hours, triple the industry standard. A Lifetime Limited Warranty backs the head.

Buy it for a fast upgrade on a standard 1/2 in-14 NPT arm. Add a bar if you want the Delta dual shower head with slide bar setup to adjust for height.

Delta 5-Setting HydroRain 2-in-1 Dual Shower HeadCheck it on Amazon
5

Delta In2ition 6-setting 2-in-1 shower head with handheld: Best for more spray choices in a Delta head

Delta In2ition 6-setting 2-in-1 shower head with handheld, Delta dual shower heads with slide bars
8.6/10Our score
  • 6-setting In2ition 2-in-1 head
  • Detachable hand shower
  • ProClean spray
  • Brushed nickel finish

A docking head with an extra shampoo-and-massage setting over the HydroRain. It shares the same in-one hand shower idea and the same need for a separate bar.

See it on Amazon

Pros

  • 6 settings including shampoo with massage
  • Finish tested against 100+ cleaners
  • Lifetime limited warranty from Delta

Cons

  • No slide bar included
  • Plastic body

The Delta In2ition is the HydroRain's sibling with one more setting. It adds a shampoo-with-massage spray on top of the same ProClean, full body, massage and rinse options, so there's a mode for almost every part of a shower.

The hand shower detaches from the center of the head and both heads can run at once. The brushed nickel finish is tested against more than 100 household cleaners and 2,000 abrasion cycles, according to Delta.

The same Touch-Clean holes make descaling a finger rub.

Like the HydroRain, it has no bar in the box. If you want the full Delta combo experience with a bar included, look at our Delta shower head and handheld combos roundup.

Both Delta heads run at 1.75 GPM and mount on a standard arm, so the choice comes down to settings rather than plumbing. Choose it over the HydroRain if the extra shampoo setting matters to you.

Otherwise the two Delta heads are close in daily use.

Delta In2ition 6-setting 2-in-1 shower head with handheldCheck it on Amazon
6

BRIGHT SHOWERS slide bar shower set with handheld: Best for grab-bar safety in the shower

BRIGHT SHOWERS slide bar shower set with handheld, Delta dual shower heads with slide bars
8.5/10Our score
  • 23.6 in ADA-compliant grab bar
  • Supports up to 250 lb
  • 9 spray settings with pause
  • 69 in stainless hose

A slide bar that doubles as a grab bar for seniors and assisted bathing. The long hose and pause setting make seated showering easier.

See it on Amazon

Pros

  • ADA-compliant grab bar
  • Extra-long 69 in hose
  • Smooth-glide height adjustment

Cons

  • Hand shower only, no overhead rain head
  • Bulkier bar than a plain slide rail

BRIGHT SHOWERS' slide bar set is the pick when safety matters more than an overhead rain head. The 23.6 in bar doubles as an ADA-compliant grab bar rated to support 250 lb, so it gives seniors and anyone with balance concerns something solid to hold.

The hand shower has 9 spray settings plus a pause for lathering without losing temperature. A 69 in hose is the longest here, giving room to rinse while seated.

The smooth-glide slider holds the hand shower wherever you leave it.

The stainless bar is easy to clean and stays stable, and the kit fits standard G1/2 wall supply elbows. This is a hand shower only, so a rain head lover will miss the overhead spray.

Its 1.8 GPM flow and single jet mean the spray is aimed at rinsing and reach, not wide coverage.

Pick it for assisted bathing or a bathroom used by older family members. The grab bar rating is the reason to choose it over the other bars here.

BRIGHT SHOWERS slide bar shower set with handheldCheck it on Amazon
7

Delta 9-spray slide bar handheld, chrome: Best for Delta build quality with a slide bar

Delta 9-spray slide bar handheld, chrome, Delta dual shower heads with slide bars
8.0/10Our score
  • 9-spray ActivTouch hand shower
  • Slide bar rated to 500 lb of force
  • 82 in stretchable hose
  • WaterSense 1.75 GPM

A true Delta slide bar handheld for bathrooms that need sturdy support and lots of sprays. The bar stays fixed while the hand shower slides.

See it on Amazon

Pros

  • Bar supports up to 500 lb of force
  • One-handed ActivTouch spray buttons
  • WaterSense certified

Cons

  • Hand shower only, no rain head
  • Plain chrome finish only

Delta's own slide bar handheld is built for bathrooms that need sturdy support. The non-rotating bar stays fixed within its fittings and supports up to 500 lb of force, twice the ADA requirement when installed properly.

The ActivTouch hand shower has 9 sprays set by three buttons and a pause, all reachable with one hand. Its non-slip grip helps keep the handle steady when your hands are wet.

The sprays run from full body and fast massage to soft drench, so there's a gentle option as well as a strong one. An internal double-check valve adds back-flow protection.

An 82 in stretchable hose is the longest in this roundup. The kit includes the hand shower, hose, slide bar and wall elbow, so the bar hardware arrives with the head.

Against the BRIGHT SHOWERS grab bar, the Delta offers more support and more sprays but costs more and lacks an overhead head.

Choose it when you want Delta reliability in a bar and handheld. You'll still need a separate overhead head for rain spray.

The instructions call for wood blocking behind the wall for the sturdiest mount.

Delta 9-spray slide bar handheld, chromeCheck it on Amazon
8

Rain and handheld combo with 27.5-inch slide bar: Best for a long adjustable rail

Rain and handheld combo with 27.5-inch slide bar, Delta dual shower heads with slide bars
7.6/10Our score
  • 27.5 in drill-free stainless bar
  • 5 in rain head and 5 in hand shower
  • Five settings on each head
  • 5 ft hose

A longer slide bar for wide height changes, paired with two five-setting 5 in heads. The tool-free bar mounts without drilling.

See it on Amazon

Pros

  • Longer 27.5 in bar
  • Angle-adjustable swivel ball joint
  • Self-cleaning nozzles

Cons

  • Fewer settings per head than the top picks
  • Bar needs a flat wall area

egretshower's 27.5 in bar is the longest slide rail here, so it gives the widest range of hand shower heights. That suits a tall adult and a small child sharing one shower.

The kit pairs a 5 in rain head and a 5 in hand shower, each with five settings, and the drill-free bar mounts without drilling. A swivel ball joint angles the rain head where you want it.

The 5 ft hose and brass-nut fittings keep the install simple.

Both heads top out at five settings, which is fewer than the top picks. Against the UCLIMAA kit, this one trades extra sprays for more bar travel.

The longer bar also needs a taller flat wall area, so measure before you commit. Its self-cleaning silicone nozzles keep mineral deposits from clogging the spray.

Pick it when height range is the whole point. The longer rail makes the up-and-down range easier for a family with very different heights.

Rain and handheld combo with 27.5-inch slide barCheck it on Amazon
9

3-way rain and handheld combo with adjustable slide bar: Best for the widest spray menu

3-way rain and handheld combo with adjustable slide bar, Delta dual shower heads with slide bars
7.4/10Our score
  • 82 total spray modes across two heads
  • 25.75 in drill-free bar
  • Power jet cleaning mode
  • 5 ft hose

A combo with a 10-setting hand shower and 9-setting head for buyers who want the most spray choices. The adjustable bar changes hand shower height.

See it on Amazon

Pros

  • 82 combined spray modes
  • Power jet mode for cleaning
  • Self-cleaning silicone nozzles

Cons

  • Lowest score here for fit and finish
  • Busy control layout

This egretshower combo offers the largest spray menu in the roundup: 82 combined modes across a 9-setting head and a 10-setting hand shower. Modes cover rain, massage, misty and sweep, plus combinations.

A single handle on the shower panel cycles through them.

The 25.75 in drill-free bar adjusts hand shower height and the power jet mode blasts soap scum from tubs and corners. Self-cleaning silicone nozzles keep mineral buildup in check.

The heads are 5.5 in and 4.7 in, so the rain head is smaller than the wide one on the other egretshower kit. An upgraded internal channel spreads pressure evenly across each outlet, which helps in low-pressure homes.

The control layout takes more getting used to than the simpler kits, and its fit and finish trails the leaders. Against the longer-bar egretshower kit, this one wins on sprays and loses on bar travel.

A 5 ft hose matches the other budget combo, so cleaning reach is similar.

Choose it if trying different sprays is part of the fun. For a straightforward family shower, the top picks are easier to live with.

3-way rain and handheld combo with adjustable slide barCheck it on Amazon

How these dual shower heads compare

The table lines up the bar type, head sizes and settings so you can see where the money goes. The best value sits in kits that include both heads and the bar, while Delta heads ask you to buy the bar separately.

ProductBest forBar typeHead sizeClearance neededOur score
UCLIMAA High Pressure 48-Settings Shower Headadjustable height for the whole familyDrill-free 304 stainless5 in x 228 in vertical wall space9.7
egretshower 7.5" Rotatable Dual Shower Headkids and low-reach switchingDrill-free stainless steel7.48 in rain, 4.7 in hand9.3
BRIGHT SHOWERS Rain Shower Head with Handheldlow water pressure homes6 in rain8.9
Delta 5-Setting HydroRain 2-in-1 Dual Shower Headquick upgrades on an existing arm8.6
Delta In2ition 6-setting 2-in-1 shower head with handheldmore spray choices in a Delta head8.6
BRIGHT SHOWERS slide bar shower set with handheldgrab-bar safety in the showerStainless steel grab bar8.5
Delta 9-spray slide bar handheld, chromeDelta build quality with a slide barNon-rotating slide bar8.0
Rain and handheld combo with 27.5-inch slide bara long adjustable rail5 in x 27.6
3-way rain and handheld combo with adjustable slide barthe widest spray menu7.4

Our score weighs specs, features and buyer feedback against what you're shopping for. A high score here means the combo solves the height problem with a solid bar and a useful spray menu, not just a long feature list.

How we compared these shower heads

We checked each combo's specs against the job a dual shower head with a bar has to do: change hand shower height without wobble, reach both heads from one diverter and hold up in a wet room. Kits that ship with a bar scored higher than head-only designs that need a separate purchase.

Bar material and load ratings carried weight. Stainless and brass bars with a stated load limit rank above plastic rails.

We also weighed head size against the shower's footprint and noted the clear wall space each kit needs. A 7.48 in rain head covers more body, but it also needs more room to tilt without hitting the bar or valves.

Setting count mattered less than how the settings are used. A 5-setting head with a good rain and massage mode beats a 10-setting head that's fiddly to switch.

Finally, we gave points for self-cleaning nozzles, since scale is the main reason shower heads lose flow over time, as our guide to how long shower heads last explains. WaterSense or stated GPM figures got a nod too, because a 1.75 GPM head stretches a hot-water tank further than an unrestricted one.

Finish durability counted as well, since salt-fog and abrasion testing hints at how a finish holds up to cleaners and daily use.

What should you measure before buying a dual shower head with a slide bar?

Measure the clear wall between your shower arm and the mixer valves first, then the wall width. Most kits need about 28 in of vertical space, and the UCLIMAA states that figure outright.

A shorter gap limits how far the hand shower can travel.

Next, measure the flat wall area for the bar's mounting plate. A drill-free bar needs a smooth, clean surface to stick, while a screw mount needs solid backing.

A bar mounted on tile over drywall may need anchors. The bar's own length sets how much flat wall you need, so a 27.5 in rail like the egretshower asks for more than a 23.6 in grab bar.

Finally, check the shower arm length. A longer arm pushes the overhead head out from the wall and clears more space for the bar below.

Delta's heads fit a standard 1/2 in-14 NPT arm, and the Delta 51900 kit brings its own wall elbow, so confirm what your wall already has before you buy.

Which bar type suits your bathroom?

Drill-free stainless bars

These mount with adhesive and need no holes. They're ideal for renters or anyone avoiding tile damage.

The UCLIMAA, egretshower and BRIGHT SHOWERS kits all offer a drill-free option, and some include anchors for a permanent mount if you prefer. Check the kit's stated clearance before you commit to adhesive, since a crowded wall gives the slider little room.

Brass and grab bars

Brass bars like the BRIGHT SHOWERS rain combo are heavier and sturdier. Grab-bar styles like the BRIGHT SHOWERS set and the Delta 51900 carry a load rating and meet ADA standards, which matters for seniors and assisted bathing.

Expect a bulkier bar and a higher price. The Delta bar's 500 lb force rating is double the ADA figure, while the BRIGHT SHOWERS set meets the 250 lb standard.

Head-only docks with a separate bar

Delta's HydroRain and In2ition dock the hand shower in the head and skip the bar. That keeps the install simple and the price lower, but you add a Delta slide bar to get height adjustment.

Buy this route if you already have a bar or want to choose the finish. Keep in mind the head docks at a fixed spot, so the bar you add is what delivers the height change.

Does a longer slide bar always mean a better shower?

No. A longer bar gives more height travel, but the hand shower's reach and the shower's layout matter more.

The egretshower 27.5 in bar wins on travel, yet the UCLIMAA kit's complete package scores higher overall.

Long bars also need more clear wall. In a small stall, a 25 to 28 in bar may be all that fits.

Pick the bar length that matches your wall, then compare sprays and materials. A shorter bar with a low diverter, like the egretshower 7.5 in head, can still be easier for a child to use than a long bar with the switch up high.

What else changes daily use on a dual shower head?

Diverter placement is the quiet factor. A low diverter, as on the UCLIMAA and the egretshower 7.5 in head, lets kids and seated bathers switch modes without reaching overhead.

A diverter up near the head is harder to use for anyone shorter.

Hose length matters for cleaning and seated showering. The Delta 51900's 82 in hose and the BRIGHT SHOWERS set's 69 in hose give more slack than the 5 ft hoses on the budget combos.

A longer hose also makes it easier to rinse the tub or wash a pet without dragging the head back to its bracket.

Spray cleaning features earn their keep over time. Silicone nozzles that rub clean, like those on the egretshower and BRIGHT SHOWERS heads, cut down on descaling.

A power-wash or ProClean mode adds a cleaning tool you'll actually use on the tub. Delta's Touch-Clean holes wipe clean with a finger, which is the same idea in a branded form.

The flow rate matters too, since a 1.75 GPM head uses less hot water than an unrestricted one while still feeling full under a rain spray.

Which dual shower head with a slide bar should you buy?

Buy the UCLIMAA kit if you want one box that covers adjustable height, two seven-setting heads and a low diverter for the whole family. It's the best dual shower head with slide bar setup for most bathrooms.

Go with the Delta HydroRain or In2ition if genuine Delta parts and a lifetime limited warranty matter more than having the bar in the box. Add a Delta slide bar to either for height adjustment.

Choose the BRIGHT SHOWERS grab-bar set for assisted bathing, the Delta 51900 for the strongest bar support, or the long-bar egretshower kit when height travel is your main need. Measure your wall clearance first, then match the kit to the people who share the shower.

Our top 3 picks at a glance

  1. 1 UCLIMAA High Pressure 48-Settings Shower Head
    Best for adjustable height for the whole family

    UCLIMAA High Pressure 48-Settings Shower Head

    9.7/10 our score

    See it on Amazon
  2. 2 egretshower 7.5" Rotatable Dual Shower Head
    Best for kids and low-reach switching

    egretshower 7.5" Rotatable Dual Shower Head

    9.3/10 our score

    See it on Amazon
  3. 3 BRIGHT SHOWERS Rain Shower Head with Handheld
    Best for low water pressure homes

    BRIGHT SHOWERS Rain Shower Head with Handheld

    8.9/10 our score

    See it on Amazon

Frequently asked questions

What vertical space does a dual shower head with slide bar need?

Plan on about 28 in of clear wall between the shower arm and the mixer valves. That clearance lets the slider move the hand shower from a child's height to a tall adult's height without hitting the overhead head.

Can two shower heads run at the same time on one valve?

Yes, when the combo has a diverter that splits flow to both heads. Expect the pressure at each head to drop when both run together, so the rain head feels softer than it does on its own.

Is a drill-free slide bar strong enough for daily use?

It can be, as long as you follow the install steps and use the adhesive on a clean, flat, dry wall. Many kits also include wall anchors for a permanent mount if you want extra peace of mind.

Why choose a Delta dual head over a cheaper combo?

Delta brings its own spray engineering and a lifetime limited warranty on its shower heads. You pay more and often still buy a separate slide bar, so the value is in the warranty and the ProClean cleaning spray.