Between the Galaxy S25 Ultra and Pixel 9a, the Galaxy S25 Ultra comes out ahead in main camera and wireless charging, while the Pixel 9a wins on weight and front camera. Overall, the Galaxy S25 Ultra scores 73.9 and the Pixel 9a scores 63.2 on our Mars Score.
Which should you buy?
The Galaxy S25 Ultra is the clear pick on raw spec strength, leading by 10.7 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 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, wireless charging, wired charging, among others.
Pick the Pixel 9a 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 weight, front camera, battery capacity.
Both ship with comparable refresh rate, 5g support, water resistance, so those specs don't separate the two — focus on the differences below.
Bottom line: the Galaxy S25 Ultra is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why Samsung - Galaxy S25 Ultra wins
- ▲Main camera — 316.67% more. 200 MP vs 48 MP.
- ▲Wireless charging — 100.00% more. 15 W vs 7.5 W.
- ▲Wired charging — 95.65% more. 45 W vs 23 W.
- ▲AnTuTu — 73.39% more. 2150000 vs 1240000.
- ▲RAM — 50.00% more. 12 GB vs 8 GB.
- ▲Pixel density — 18.72% more. 501 ppi vs 422 ppi.
- ▲Screen size — 9.52% more. 6.9 " vs 6.3 ".
Why Google - Pixel 9a wins
- ▲Weight — 32.00 g less. 186 vs 218.
- ▲Front camera — 8.33% more. 13 MP vs 12 MP.
- ▲Battery capacity — 2.00% more. 5100 mAh vs 5000 mAh.
Spec comparison
Design
| Spec | Samsung - Galaxy S25 Ultra | Google - Pixel 9a |
|---|---|---|
| Weight | 218 g | 186 glead |
| Thickness | 8.2 mmlead | 8.9 mm |
| Water resistanceⓘ | IP68 | IP68 |
| Form factor | bar | bar |
Display
| Spec | Samsung - Galaxy S25 Ultra | Google - Pixel 9a |
|---|---|---|
| Screen sizeⓘ | 6.9 "lead | 6.3 " |
| Pixel densityⓘ | 501 ppilead | 422 ppi |
| Refresh rateⓘ | 120 Hz | 120 Hz |
| Peak brightnessⓘ | 2600 nits | 2700 nitslead |
Performance
Cameras
| Spec | Samsung - Galaxy S25 Ultra | Google - Pixel 9a |
|---|---|---|
| Main cameraⓘ | 200 MPlead | 48 MP |
| Front camera | 12 MP | 13 MPlead |
| Optical image stabilizationⓘ | true | true |
Battery
| Spec | Samsung - Galaxy S25 Ultra | Google - Pixel 9a |
|---|---|---|
| Battery capacity | 5000 mAh | 5100 mAhlead |
| Wired chargingⓘ | 45 Wlead | 23 W |
| Wireless chargingⓘ | 15 Wlead | 7.5 W |
Connectivity
| Spec | Samsung - Galaxy S25 Ultra | Google - Pixel 9a |
|---|---|---|
| 5G supportⓘ | true | true |
| Headphone jack | false | false |
| microSD slot | false | false |
Operating System
| Spec | Samsung - Galaxy S25 Ultra | Google - Pixel 9a |
|---|---|---|
| OS | Android | Android |
| Promised OS updates | 7 years | 7 years |
Frequently asked
Which has better battery, Galaxy S25 Ultra or Pixel 9a?+
Pixel 9a has 2.0% more battery — 5000 mAh vs 5100 mAh.
Which is lighter, Galaxy S25 Ultra or Pixel 9a?+
Pixel 9a is 32g lighter — 218g vs 186g.
Is Galaxy S25 Ultra waterproof?+
Galaxy S25 Ultra has an IP68 rating.
Does Pixel 9a support 5G?+
Yes, Pixel 9a supports 5G.
Which has more RAM, Galaxy S25 Ultra or Pixel 9a?+
Galaxy S25 Ultra offers 12GB of RAM.
Which has a better camera, Galaxy S25 Ultra or Pixel 9a?+
Galaxy S25 Ultra has a 200 MP main camera vs 48 MP.
Spec-level deep dives
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