Between the Phone (3a) Pro and Xiaomi 15, the Phone (3a) Pro comes out ahead in front camera and screen size, while the Xiaomi 15 wins on antutu and wired charging. Overall, the Phone (3a) Pro scores 63.8 and the Xiaomi 15 scores 70 on our Mars Score.
Which should you buy?
The Xiaomi 15 edges ahead on the Mars Score (63.8 vs 70), but the 6.2-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the Phone (3a) Pro if you photograph or shoot video regularly and want the better imaging pipeline of the two. The biggest gaps in its favor are front camera, screen size.
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 antutu, wired charging, weight, among others.
Both ship with comparable ram, main camera, refresh rate, so those specs don't separate the two — focus on the differences below.
Bottom line: the Xiaomi 15 is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why Nothing - Phone (3a) Pro wins
- ▲Front camera — 56.25% more. 50 MP vs 32 MP.
- ▲Screen size — 6.45% more. 6.77 " vs 6.36 ".
Why Xiaomi 15 wins
- ▲AnTuTu — 215.29% more. 2680000 vs 850000.
- ▲Wired charging — 80.00% more. 90 W vs 50 W.
- ▲Weight — 19.00 g less. 192 vs 211.
- ▲Pixel density — 18.86% more. 460 ppi vs 387 ppi.
- ▲Battery capacity — 8.00% more. 5400 mAh vs 5000 mAh.
- ▲Water resistance: IP68 (vs IP64).
- ▲Promised OS updates: 4 (vs 3).
- ▲Wireless charging: 50 W vs 0 W.
Spec comparison
Design
| Spec | Nothing - Phone (3a) Pro | Xiaomi 15 |
|---|---|---|
| Weight | 211 g | 192 glead |
| Thickness | 8.4 mm | 8.1 mmlead |
| Water resistanceⓘ | IP64 | IP68lead |
| Form factor | bar | bar |
Display
| Spec | Nothing - Phone (3a) Pro | Xiaomi 15 |
|---|---|---|
| Screen sizeⓘ | 6.77 "lead | 6.36 " |
| Pixel densityⓘ | 387 ppi | 460 ppilead |
| Refresh rateⓘ | 120 Hz | 120 Hz |
| Peak brightnessⓘ | 3000 nits | 3200 nitslead |
Performance
Cameras
| Spec | Nothing - Phone (3a) Pro | Xiaomi 15 |
|---|---|---|
| Main cameraⓘ | 50 MP | 50 MP |
| Front camera | 50 MPlead | 32 MP |
| Optical image stabilizationⓘ | true | true |
Battery
| Spec | Nothing - Phone (3a) Pro | Xiaomi 15 |
|---|---|---|
| Battery capacity | 5000 mAh | 5400 mAhlead |
| Wired chargingⓘ | 50 W | 90 Wlead |
| Wireless chargingⓘ | 0 W | 50 Wlead |
Connectivity
| Spec | Nothing - Phone (3a) Pro | Xiaomi 15 |
|---|---|---|
| 5G supportⓘ | true | true |
| Headphone jack | false | false |
| microSD slot | false | false |
Operating System
| Spec | Nothing - Phone (3a) Pro | Xiaomi 15 |
|---|---|---|
| OS | Android | Android |
| Promised OS updates | 3 years | 4 yearslead |
Frequently asked
Which has better battery, Phone (3a) Pro or Xiaomi 15?+
Xiaomi 15 has 8.0% more battery — 5000 mAh vs 5400 mAh.
Which is lighter, Phone (3a) Pro or Xiaomi 15?+
Xiaomi 15 is 19g lighter — 211g vs 192g.
Is Phone (3a) Pro waterproof?+
Phone (3a) Pro has an IP64 rating.
Does Xiaomi 15 support 5G?+
Yes, Xiaomi 15 supports 5G.
Which has a better camera, Phone (3a) Pro or Xiaomi 15?+
Xiaomi 15 has a 50 MP main camera vs 50 MP.
Spec-level deep dives
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