Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Samsung - Galaxy S25 Ultra | OnePlus 15 |
|---|---|---|
| Main camera | 200 MP | 50 MP |
| Wireless charging | 15 W | 50 W |
| Wired charging | 45 W | 120 W |
| Front camera | 12 MP | 32 MP |
| Battery capacity | 5000 mAh | 7500 mAh |
| AnTuTu | 2150000 | 2950000 |
Between the Galaxy S25 Ultra and OnePlus 15, the Galaxy S25 Ultra comes out ahead in main camera / pixel density, while the OnePlus 15 wins on wireless charging / wired charging. Overall, the Galaxy S25 Ultra scores 73.3 and the OnePlus 15 scores 76.7 on our Mars Score.
Which should you buy?
The OnePlus 15 edges ahead on the Mars Score (73.3 vs 76.7), but the 3.4-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the Galaxy S25 Ultra if you photograph or shoot video regularly and want the better imaging pipeline of the two. The biggest gaps in its favor are main camera, pixel density, screen size, among others. The single most decisive one: Main camera — 300.00% more. 200 MP vs 50 MP.
Pick the OnePlus 15 if you care most about wireless charging / wired charging. Its strongest claims are wireless charging, wired charging, front camera, among others. The single most decisive one: Wireless charging — 233.33% more. 50 W vs 15 W.
Both ship with comparable refresh rate, 5g support, optical image stabilization, so those specs do not 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 says both are well-rounded; the differences are about trade-offs, not quality.
Which should you buy: Samsung - Galaxy S25 Ultra or OnePlus 15?
OnePlus 15 leads the current Mars Score by 3.4 points.The more useful decision is the trade-off behind that result: compare screen size, ram, pixel density, battery capacity against the way you will actually use the product.
Choose Samsung - Galaxy S25 Ultra if…
Samsung - Galaxy S25 Ultra has the measurable edge on main cam mp, pixel density ppi, screen size in.
Choose OnePlus 15 if…
OnePlus 15 has the measurable edge on wireless charging w, wired charging w, front cam mp.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why Samsung - Galaxy S25 Ultra wins
- ▲Main camera — 300.00% more. 200 MP vs 50 MP.
- ▲Pixel density — 11.33% more. 501 ppi vs 450 ppi.
- ▲Screen size — 1.77% more. 6.9 " vs 6.78 ".
- ▲Promised OS updates: 7 (vs 5).
Why OnePlus 15 wins
- ▲Wireless charging — 233.33% more. 50 W vs 15 W.
- ▲Wired charging — 166.67% more. 120 W vs 45 W.
- ▲Front camera — 166.67% more. 32 MP vs 12 MP.
- ▲Battery capacity — 50.00% more. 7500 mAh vs 5000 mAh.
- ▲AnTuTu — 37.21% more. 2950000 vs 2150000.
- ▲RAM — 33.33% more. 16 GB vs 12 GB.
- ▲Weight — 7.00 g less. 211 vs 218.
- ▲Water resistance: IP69 (vs IP68).
Spec comparison
Design
| Spec | Samsung - Galaxy S25 Ultra | OnePlus 15 |
|---|---|---|
| Weight | 218 g | 211 glead |
| Thickness | 8.2 mmlead | 8.3 mm |
| Water resistanceⓘ | IP68 | IP69lead |
| Form factor | bar | bar |
Display
| Spec | Samsung - Galaxy S25 Ultra | OnePlus 15 |
|---|---|---|
| Screen size | 6.9 "lead | 6.78 " |
| Pixel densityⓘ | 501 ppilead | 450 ppi |
| Refresh rateⓘ | 120 Hz | 120 Hz |
| Peak brightnessⓘ | 2600 nits | 4500 nitslead |
Performance
| Spec | Samsung - Galaxy S25 Ultra | OnePlus 15 |
|---|---|---|
| RAMⓘ | 12 GB | 16 GBlead |
| Storageⓘ | 256 GB | 512 GBlead |
| AnTuTuⓘ | 2150000 | 2950000lead |
| CPU total clockⓘ | 21.4 GHz | 23.6 GHzlead |
Cameras
| Spec | Samsung - Galaxy S25 Ultra | OnePlus 15 |
|---|---|---|
| Main cameraⓘ | 200 MPlead | 50 MP |
| Front camera | 12 MP | 32 MPlead |
| Optical image stabilizationⓘ | true | true |
Battery
| Spec | Samsung - Galaxy S25 Ultra | OnePlus 15 |
|---|---|---|
| Battery capacityⓘ | 5000 mAh | 7500 mAhlead |
| Wired chargingⓘ | 45 W | 120 Wlead |
| Wireless chargingⓘ | 15 W | 50 Wlead |
Connectivity
| Spec | Samsung - Galaxy S25 Ultra | OnePlus 15 |
|---|---|---|
| 5G supportⓘ | true | true |
| Headphone jack | false | false |
| microSD slot | false | false |
Operating System
| Spec | Samsung - Galaxy S25 Ultra | OnePlus 15 |
|---|---|---|
| OS | Android | Android |
| Promised OS updates | 7 yearslead | 5 years |
Frequently asked
Which has better battery, Galaxy S25 Ultra or OnePlus 15?+
OnePlus 15 has 50.0% more battery — 5000 mAh vs 7500 mAh.
Which is lighter, Galaxy S25 Ultra or OnePlus 15?+
OnePlus 15 is 7g lighter — 218g vs 211g.
Is Galaxy S25 Ultra waterproof?+
Galaxy S25 Ultra has an IP68 rating.
Does OnePlus 15 support 5G?+
Yes, OnePlus 15 supports 5G.
Which has more RAM, Galaxy S25 Ultra or OnePlus 15?+
OnePlus 15 offers 16GB of RAM.
Which has a better camera, Galaxy S25 Ultra or OnePlus 15?+
Galaxy S25 Ultra has a 200 MP main camera vs 50 MP.