Between the Razr 50 Ultra and Xiaomi 15, the Razr 50 Ultra comes out ahead in refresh rate and screen size, while the Xiaomi 15 wins on wireless charging and wired charging. Overall, the Razr 50 Ultra scores 65.6 and the Xiaomi 15 scores 70 on our Mars Score.
Which should you buy?
The Xiaomi 15 edges ahead on the Mars Score (65.6 vs 70), but the 4.4-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the Razr 50 Ultra 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 refresh rate, screen size, weight, among others.
Pick the Xiaomi 15 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 ram, main camera, 5g support, so those specs don't separate the two — focus on the differences below.
Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity tells you both are well-rounded; the differences are about trade-offs, not quality.
Why Motorola - Razr 50 Ultra wins
- ▲Refresh rate — 37.50% more. 165 Hz vs 120 Hz.
- ▲Screen size — 8.49% more. 6.9 " vs 6.36 ".
- ▲Weight — 3.00 g less. 189 vs 192.
- ▲Water resistance: IPX8 (vs IP68).
Why Xiaomi 15 wins
- ▲Wireless charging — 233.33% more. 50 W vs 15 W.
- ▲Wired charging — 100.00% more. 90 W vs 45 W.
- ▲AnTuTu — 66.46% more. 2680000 vs 1610000.
- ▲Battery capacity — 35.00% more. 5400 mAh vs 4000 mAh.
- ▲Pixel density — 11.38% more. 460 ppi vs 413 ppi.
- ▲Promised OS updates: 4 (vs 3).
Spec comparison
Design
| Spec | Motorola - Razr 50 Ultra | Xiaomi 15 |
|---|---|---|
| Weight | 189 glead | 192 g |
| Thickness | 7.1 mmlead | 8.1 mm |
| Water resistanceⓘ | IPX8lead | IP68 |
| Form factor | foldable_clamshelllead | bar |
Display
| Spec | Motorola - Razr 50 Ultra | Xiaomi 15 |
|---|---|---|
| Screen sizeⓘ | 6.9 "lead | 6.36 " |
| Pixel densityⓘ | 413 ppi | 460 ppilead |
| Refresh rateⓘ | 165 Hzlead | 120 Hz |
| Peak brightnessⓘ | 3000 nits | 3200 nitslead |
Performance
Cameras
| Spec | Motorola - Razr 50 Ultra | Xiaomi 15 |
|---|---|---|
| Main cameraⓘ | 50 MP | 50 MP |
| Front camera | 32 MP | 32 MP |
| Optical image stabilizationⓘ | true | true |
Battery
| Spec | Motorola - Razr 50 Ultra | Xiaomi 15 |
|---|---|---|
| Battery capacity | 4000 mAh | 5400 mAhlead |
| Wired chargingⓘ | 45 W | 90 Wlead |
| Wireless chargingⓘ | 15 W | 50 Wlead |
Connectivity
| Spec | Motorola - Razr 50 Ultra | Xiaomi 15 |
|---|---|---|
| 5G supportⓘ | true | true |
| Headphone jack | false | false |
| microSD slot | false | false |
Operating System
| Spec | Motorola - Razr 50 Ultra | Xiaomi 15 |
|---|---|---|
| OS | Android | Android |
| Promised OS updates | 3 years | 4 yearslead |
Frequently asked
Which has better battery, Razr 50 Ultra or Xiaomi 15?+
Xiaomi 15 has 35.0% more battery — 4000 mAh vs 5400 mAh.
Which is lighter, Razr 50 Ultra or Xiaomi 15?+
Razr 50 Ultra is 3g lighter — 189g vs 192g.
Is Razr 50 Ultra waterproof?+
Razr 50 Ultra has an IPX8 rating.
Does Xiaomi 15 support 5G?+
Yes, Xiaomi 15 supports 5G.
Which has a better camera, Razr 50 Ultra or Xiaomi 15?+
Xiaomi 15 has a 50 MP main camera vs 50 MP.
Spec-level deep dives
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