Between the Z70 Ultra and Xiaomi 15, the Z70 Ultra comes out ahead in ram and refresh rate, while the Xiaomi 15 wins on wireless charging and front camera. Overall, the Z70 Ultra scores 75.1 and the Xiaomi 15 scores 70 on our Mars Score.
Which should you buy?
The Z70 Ultra edges ahead on the Mars Score (75.1 vs 70), but the 5.1-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the Z70 Ultra if your top frustration with your current device is running out of charge before the day ends — endurance is the lead spec here. The biggest gaps in its favor are ram, refresh rate, battery capacity, among others.
Pick the Xiaomi 15 if you photograph or shoot video regularly and want the better imaging pipeline of the two. Its strongest claims are wireless charging, front camera, weight, among others.
Both ship with comparable main camera, 5g support, water resistance, so those specs don't separate the two — focus on the differences below.
Bottom line: the Z70 Ultra is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why Nubia - Z70 Ultra wins
- ▲RAM — 33.33% more. 16 GB vs 12 GB.
- ▲Refresh rate — 20.00% more. 144 Hz vs 120 Hz.
- ▲Battery capacity — 13.89% more. 6150 mAh vs 5400 mAh.
- ▲Screen size — 7.70% more. 6.85 " vs 6.36 ".
Why Xiaomi 15 wins
- ▲Wireless charging — 233.33% more. 50 W vs 15 W.
- ▲Front camera — 100.00% more. 32 MP vs 16 MP.
- ▲Weight — 35.00 g less. 192 vs 227.
- ▲Pixel density — 18.56% more. 460 ppi vs 388 ppi.
- ▲Wired charging — 12.50% more. 90 W vs 80 W.
- ▲AnTuTu — 1.52% more. 2680000 vs 2640000.
- ▲Promised OS updates: 4 (vs 3).
Spec comparison
Design
| Spec | Nubia - Z70 Ultra | Xiaomi 15 |
|---|---|---|
| Weight | 227 g | 192 glead |
| Thickness | 8.7 mm | 8.1 mmlead |
| Water resistanceⓘ | IP68 | IP68 |
| Form factor | bar | bar |
Display
| Spec | Nubia - Z70 Ultra | Xiaomi 15 |
|---|---|---|
| Screen sizeⓘ | 6.85 "lead | 6.36 " |
| Pixel densityⓘ | 388 ppi | 460 ppilead |
| Refresh rateⓘ | 144 Hzlead | 120 Hz |
| Peak brightnessⓘ | 2000 nits | 3200 nitslead |
Performance
Cameras
| Spec | Nubia - Z70 Ultra | Xiaomi 15 |
|---|---|---|
| Main cameraⓘ | 50 MP | 50 MP |
| Front camera | 16 MP | 32 MPlead |
| Optical image stabilizationⓘ | true | true |
Battery
| Spec | Nubia - Z70 Ultra | Xiaomi 15 |
|---|---|---|
| Battery capacity | 6150 mAhlead | 5400 mAh |
| Wired chargingⓘ | 80 W | 90 Wlead |
| Wireless chargingⓘ | 15 W | 50 Wlead |
Connectivity
| Spec | Nubia - Z70 Ultra | Xiaomi 15 |
|---|---|---|
| 5G supportⓘ | true | true |
| Headphone jack | false | false |
| microSD slot | false | false |
Operating System
| Spec | Nubia - Z70 Ultra | Xiaomi 15 |
|---|---|---|
| OS | Android | Android |
| Promised OS updates | 3 years | 4 yearslead |
Frequently asked
Which has better battery, Z70 Ultra or Xiaomi 15?+
Z70 Ultra has 13.9% more battery — 6150 mAh vs 5400 mAh.
Which is lighter, Z70 Ultra or Xiaomi 15?+
Xiaomi 15 is 35g lighter — 227g vs 192g.
Is Z70 Ultra waterproof?+
Z70 Ultra has an IP68 rating.
Does Xiaomi 15 support 5G?+
Yes, Xiaomi 15 supports 5G.
Which has more RAM, Z70 Ultra or Xiaomi 15?+
Z70 Ultra offers 16GB of RAM.
Which has a better camera, Z70 Ultra or Xiaomi 15?+
Xiaomi 15 has a 50 MP main camera vs 50 MP.
Spec-level deep dives
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