Between the Galaxy S25 Ultra and MIX Fold 4, the Galaxy S25 Ultra comes out ahead in main camera and pixel density, while the MIX Fold 4 wins on wireless charging and front camera. Overall, the Galaxy S25 Ultra scores 73.9 and the MIX Fold 4 scores 71.4 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (73.9 vs 71.4). The decision isn't about overall quality — both clear the bar — it's about which specific trade-offs fit your use.
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, weight, among others.
Pick the MIX Fold 4 if you photograph or shoot video regularly and want the better imaging pipeline of the two. Its strongest claims are wireless charging, front camera, wired charging, among others.
Both ship with comparable refresh rate, 5g support, optical image stabilization, so those specs don't 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 tells you both are well-rounded; the differences are about trade-offs, not quality.
Why Samsung - Galaxy S25 Ultra wins
- ▲Main camera — 300.00% more. 200 MP vs 50 MP.
- ▲Pixel density — 24.63% more. 501 ppi vs 402 ppi.
- ▲Weight — 8.00 g less. 218 vs 226.
- ▲AnTuTu — 5.39% more. 2150000 vs 2040000.
- ▲Promised OS updates: 7 (vs 4).
Why Xiaomi - MIX Fold 4 wins
- ▲Wireless charging — 233.33% more. 50 W vs 15 W.
- ▲Front camera — 66.67% more. 20 MP vs 12 MP.
- ▲Wired charging — 48.89% more. 67 W vs 45 W.
- ▲RAM — 33.33% more. 16 GB vs 12 GB.
- ▲Screen size — 15.65% more. 7.98 " vs 6.9 ".
- ▲Battery capacity — 2.00% more. 5100 mAh vs 5000 mAh.
- ▲Water resistance: IPX8 (vs IP68).
Spec comparison
Design
| Spec | Samsung - Galaxy S25 Ultra | Xiaomi - MIX Fold 4 |
|---|---|---|
| Weight | 218 glead | 226 g |
| Thickness | 8.2 mmlead | 9.47 mm |
| Water resistanceⓘ | IP68 | IPX8lead |
| Form factor | bar | foldable_booklead |
Display
| Spec | Samsung - Galaxy S25 Ultra | Xiaomi - MIX Fold 4 |
|---|---|---|
| Screen sizeⓘ | 6.9 " | 7.98 "lead |
| Pixel densityⓘ | 501 ppilead | 402 ppi |
| Refresh rateⓘ | 120 Hz | 120 Hz |
| Peak brightnessⓘ | 2600 nits | 3000 nitslead |
Performance
Cameras
| Spec | Samsung - Galaxy S25 Ultra | Xiaomi - MIX Fold 4 |
|---|---|---|
| Main cameraⓘ | 200 MPlead | 50 MP |
| Front camera | 12 MP | 20 MPlead |
| Optical image stabilizationⓘ | true | true |
Battery
| Spec | Samsung - Galaxy S25 Ultra | Xiaomi - MIX Fold 4 |
|---|---|---|
| Battery capacity | 5000 mAh | 5100 mAhlead |
| Wired chargingⓘ | 45 W | 67 Wlead |
| Wireless chargingⓘ | 15 W | 50 Wlead |
Connectivity
| Spec | Samsung - Galaxy S25 Ultra | Xiaomi - MIX Fold 4 |
|---|---|---|
| 5G supportⓘ | true | true |
| Headphone jack | false | false |
| microSD slot | false | false |
Operating System
| Spec | Samsung - Galaxy S25 Ultra | Xiaomi - MIX Fold 4 |
|---|---|---|
| OS | Android | Android |
| Promised OS updates | 7 yearslead | 4 years |
Frequently asked
Which has better battery, Galaxy S25 Ultra or MIX Fold 4?+
MIX Fold 4 has 2.0% more battery — 5000 mAh vs 5100 mAh.
Which is lighter, Galaxy S25 Ultra or MIX Fold 4?+
Galaxy S25 Ultra is 8g lighter — 218g vs 226g.
Is Galaxy S25 Ultra waterproof?+
Galaxy S25 Ultra has an IP68 rating.
Does MIX Fold 4 support 5G?+
Yes, MIX Fold 4 supports 5G.
Which has more RAM, Galaxy S25 Ultra or MIX Fold 4?+
MIX Fold 4 offers 16GB of RAM.
Which has a better camera, Galaxy S25 Ultra or MIX Fold 4?+
Galaxy S25 Ultra has a 200 MP main camera vs 50 MP.
Spec-level deep dives
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