Between the Razr 50 and Xiaomi 15 Ultra, the Razr 50 comes out ahead in weight and screen size, while the Xiaomi 15 Ultra wins on wireless charging and wired charging. Overall, the Razr 50 scores 60.2 and the Xiaomi 15 Ultra scores 73.8 on our Mars Score.
Which should you buy?
The Xiaomi 15 Ultra is the clear pick on raw spec strength, leading by 13.6 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.
Pick the Razr 50 if the display is what you stare at all day — refresh rate, brightness, or sharpness is where the difference will be most visible. The biggest gaps in its favor are weight, screen size, water resistance.
Pick the Xiaomi 15 Ultra if you push the hardware — gaming, on-device AI, heavy multitasking — and the extra compute headroom is worth the trade-offs. Its strongest claims are wireless charging, wired charging, antutu, among others.
Both ship with comparable main camera, refresh rate, 5g support, so those specs don't separate the two — focus on the differences below.
Bottom line: the Xiaomi 15 Ultra is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why Motorola - Razr 50 wins
- ▲Weight — 41.00 g less. 188 vs 229.
- ▲Screen size — 2.53% more. 6.9 " vs 6.73 ".
- ▲Water resistance: IPX8 (vs IP68).
Why Xiaomi 15 Ultra wins
- ▲Wireless charging — 433.33% more. 80 W vs 15 W.
- ▲Wired charging — 260.00% more. 90 W vs 25 W.
- ▲AnTuTu — 248.72% more. 2720000 vs 780000.
- ▲RAM — 100.00% more. 16 GB vs 8 GB.
- ▲Battery capacity — 42.86% more. 6000 mAh vs 4200 mAh.
- ▲Pixel density — 26.39% more. 522 ppi vs 413 ppi.
- ▲Promised OS updates: 4 (vs 3).
Spec comparison
Design
| Spec | Motorola - Razr 50 | Xiaomi 15 Ultra |
|---|---|---|
| Weight | 188 glead | 229 g |
| Thickness | 7.3 mmlead | 9.4 mm |
| Water resistanceⓘ | IPX8lead | IP68 |
| Form factor | foldable_clamshelllead | bar |
Display
| Spec | Motorola - Razr 50 | Xiaomi 15 Ultra |
|---|---|---|
| Screen sizeⓘ | 6.9 "lead | 6.73 " |
| Pixel densityⓘ | 413 ppi | 522 ppilead |
| Refresh rateⓘ | 120 Hz | 120 Hz |
| Peak brightnessⓘ | 3000 nits | 3200 nitslead |
Performance
Cameras
| Spec | Motorola - Razr 50 | Xiaomi 15 Ultra |
|---|---|---|
| Main cameraⓘ | 50 MP | 50 MP |
| Front camera | 32 MP | 32 MP |
| Optical image stabilizationⓘ | true | true |
Battery
| Spec | Motorola - Razr 50 | Xiaomi 15 Ultra |
|---|---|---|
| Battery capacity | 4200 mAh | 6000 mAhlead |
| Wired chargingⓘ | 25 W | 90 Wlead |
| Wireless chargingⓘ | 15 W | 80 Wlead |
Connectivity
| Spec | Motorola - Razr 50 | Xiaomi 15 Ultra |
|---|---|---|
| 5G supportⓘ | true | true |
| Headphone jack | false | false |
| microSD slot | false | false |
Operating System
| Spec | Motorola - Razr 50 | Xiaomi 15 Ultra |
|---|---|---|
| OS | Android | Android |
| Promised OS updates | 3 years | 4 yearslead |
Frequently asked
Which has better battery, Razr 50 or Xiaomi 15 Ultra?+
Xiaomi 15 Ultra has 42.9% more battery — 4200 mAh vs 6000 mAh.
Which is lighter, Razr 50 or Xiaomi 15 Ultra?+
Razr 50 is 41g lighter — 188g vs 229g.
Is Razr 50 waterproof?+
Razr 50 has an IPX8 rating.
Does Xiaomi 15 Ultra support 5G?+
Yes, Xiaomi 15 Ultra supports 5G.
Which has more RAM, Razr 50 or Xiaomi 15 Ultra?+
Xiaomi 15 Ultra offers 16GB of RAM.
Which has a better camera, Razr 50 or Xiaomi 15 Ultra?+
Xiaomi 15 Ultra has a 50 MP main camera vs 50 MP.
Spec-level deep dives
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