Between the Phone (3a) Pro and OnePlus 15, the Phone (3a) Pro comes out ahead in front camera, while the OnePlus 15 wins on antutu and wired charging. Overall, the Phone (3a) Pro scores 63.8 and the OnePlus 15 scores 78.4 on our Mars Score.
Which should you buy?
The OnePlus 15 is the clear pick on raw spec strength, leading by 14.6 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 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.
Pick the OnePlus 15 if your top frustration with your current device is running out of charge before the day ends — endurance is the lead spec here. Its strongest claims are antutu, wired charging, battery capacity, among others.
Both ship with comparable main camera, refresh rate, weight, so those specs don't separate the two — focus on the differences below.
Bottom line: the OnePlus 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.
Why OnePlus 15 wins
- ▲AnTuTu — 247.06% more. 2950000 vs 850000.
- ▲Wired charging — 140.00% more. 120 W vs 50 W.
- ▲Battery capacity — 50.00% more. 7500 mAh vs 5000 mAh.
- ▲RAM — 33.33% more. 16 GB vs 12 GB.
- ▲Pixel density — 16.28% more. 450 ppi vs 387 ppi.
- ▲Water resistance: IP69 (vs IP64).
- ▲Promised OS updates: 5 (vs 3).
- ▲Screen size — 0.15% more. 6.78 " vs 6.77 ".
Spec comparison
Design
| Spec | Nothing - Phone (3a) Pro | OnePlus 15 |
|---|---|---|
| Weight | 211 g | 211 g |
| Thickness | 8.4 mm | 8.3 mmlead |
| Water resistanceⓘ | IP64 | IP69lead |
| Form factor | bar | bar |
Display
| Spec | Nothing - Phone (3a) Pro | OnePlus 15 |
|---|---|---|
| Screen sizeⓘ | 6.77 " | 6.78 "lead |
| Pixel densityⓘ | 387 ppi | 450 ppilead |
| Refresh rateⓘ | 120 Hz | 120 Hz |
| Peak brightnessⓘ | 3000 nits | 4500 nitslead |
Performance
Cameras
| Spec | Nothing - Phone (3a) Pro | OnePlus 15 |
|---|---|---|
| Main cameraⓘ | 50 MP | 50 MP |
| Front camera | 50 MPlead | 32 MP |
| Optical image stabilizationⓘ | true | true |
Battery
| Spec | Nothing - Phone (3a) Pro | OnePlus 15 |
|---|---|---|
| Battery capacity | 5000 mAh | 7500 mAhlead |
| Wired chargingⓘ | 50 W | 120 Wlead |
| Wireless chargingⓘ | 0 W | 50 Wlead |
Connectivity
| Spec | Nothing - Phone (3a) Pro | OnePlus 15 |
|---|---|---|
| 5G supportⓘ | true | true |
| Headphone jack | false | false |
| microSD slot | false | false |
Operating System
| Spec | Nothing - Phone (3a) Pro | OnePlus 15 |
|---|---|---|
| OS | Android | Android |
| Promised OS updates | 3 years | 5 yearslead |
Frequently asked
Which has better battery, Phone (3a) Pro or OnePlus 15?+
OnePlus 15 has 50.0% more battery — 5000 mAh vs 7500 mAh.
Which is lighter, Phone (3a) Pro or OnePlus 15?+
OnePlus 15 is 0g lighter — 211g vs 211g.
Is Phone (3a) Pro waterproof?+
Phone (3a) Pro has an IP64 rating.
Does OnePlus 15 support 5G?+
Yes, OnePlus 15 supports 5G.
Which has more RAM, Phone (3a) Pro or OnePlus 15?+
OnePlus 15 offers 16GB of RAM.
Which has a better camera, Phone (3a) Pro or OnePlus 15?+
OnePlus 15 has a 50 MP main camera vs 50 MP.
Spec-level deep dives
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