Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Apple - iPhone 18 Pro Max | Xiaomi 15 |
|---|---|---|
| Wireless charging | 25 W | 50 W |
| Front camera | 18 MP | 32 MP |
| Weight | 249 g | 192 g |
| Wired charging | 60 W | 90 W |
| AnTuTu | 3550000 | 2680000 |
| Screen size | 6.9 " | 6.36 " |
Between the iPhone 18 Pro Max and Xiaomi 15, the iPhone 18 Pro Max comes out ahead in antutu / screen size, while the Xiaomi 15 wins on wireless charging / front camera. Overall, the iPhone 18 Pro Max scores 69.9 and the Xiaomi 15 scores 69.8 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (69.9 vs 69.8). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
Pick the iPhone 18 Pro Max if the display is what you stare at all day — refresh rate, brightness, or sharpness is where the difference will be most visible. The biggest gaps in its favor are antutu, screen size, promised os updates. The single most decisive one: AnTuTu — 32.46% more. 3550000 vs 2680000.
Pick the Xiaomi 15 if you photograph or shoot video regularly and want the better imaging pipeline of the two. Its strongest claims are wireless charging, front camera, weight, among others. The single most decisive one: Wireless charging — 100.00% more. 50 W vs 25 W.
Both ship with comparable ram, refresh rate, 5g support, 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: Apple - iPhone 18 Pro Max or Xiaomi 15?
Apple - iPhone 18 Pro Max leads the current Mars Score by 0.1 points.The more useful decision is the trade-off behind that result: compare screen size, battery capacity against the way you will actually use the product.
Choose Apple - iPhone 18 Pro Max if…
Apple - iPhone 18 Pro Max has the measurable edge on antutu score, screen size in, promised os years.
Choose Xiaomi 15 if…
Xiaomi 15 has the measurable edge on wireless charging w, front cam mp, weight g.
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 Apple - iPhone 18 Pro Max wins
- ▲AnTuTu — 32.46% more. 3550000 vs 2680000.
- ▲Screen size — 8.49% more. 6.9 " vs 6.36 ".
- ▲Promised OS updates: 6 (vs 4).
Why Xiaomi 15 wins
- ▲Wireless charging — 100.00% more. 50 W vs 25 W.
- ▲Front camera — 77.78% more. 32 MP vs 18 MP.
- ▲Weight — 57.00 g less. 192 vs 249.
- ▲Wired charging — 50.00% more. 90 W vs 60 W.
- ▲Main camera — 4.17% more. 50 MP vs 48 MP.
- ▲Battery capacity — 0.17% more. 5400 mAh vs 5391 mAh.
Spec comparison
Design
| Spec | Apple - iPhone 18 Pro Max | Xiaomi 15 |
|---|---|---|
| Weight | 249 g | 192 glead |
| Thickness | 8.75 mm | 8.1 mmlead |
| Water resistanceⓘ | IP68 | IP68 |
| Form factor | bar | bar |
Display
| Spec | Apple - iPhone 18 Pro Max | Xiaomi 15 |
|---|---|---|
| Screen size | 6.9 "lead | 6.36 " |
| Pixel densityⓘ | 460 ppi | 460 ppi |
| Refresh rateⓘ | 120 Hz | 120 Hz |
| Peak brightnessⓘ | 3000 nits | 3200 nitslead |
Performance
| Spec | Apple - iPhone 18 Pro Max | Xiaomi 15 |
|---|---|---|
| RAMⓘ | 12 GB | 12 GB |
| Storageⓘ | 256 GB | 256 GB |
| AnTuTuⓘ | 3550000lead | 2680000 |
| CPU total clockⓘ | 20.3 GHz | 22.8 GHzlead |
Cameras
| Spec | Apple - iPhone 18 Pro Max | Xiaomi 15 |
|---|---|---|
| Main cameraⓘ | 48 MP | 50 MPlead |
| Front camera | 18 MP | 32 MPlead |
| Optical image stabilizationⓘ | true | true |
Battery
| Spec | Apple - iPhone 18 Pro Max | Xiaomi 15 |
|---|---|---|
| Battery capacityⓘ | 5391 mAh | 5400 mAhlead |
| Wired chargingⓘ | 60 W | 90 Wlead |
| Wireless chargingⓘ | 25 W | 50 Wlead |
Connectivity
| Spec | Apple - iPhone 18 Pro Max | Xiaomi 15 |
|---|---|---|
| 5G supportⓘ | true | true |
| Headphone jack | false | false |
| microSD slot | false | false |
Operating System
| Spec | Apple - iPhone 18 Pro Max | Xiaomi 15 |
|---|---|---|
| OS | iOSlead | Android |
| Promised OS updates | 6 yearslead | 4 years |
Frequently asked
Which has better battery, iPhone 18 Pro Max or Xiaomi 15?+
Xiaomi 15 has 0.2% more battery — 5391 mAh vs 5400 mAh.
Which is lighter, iPhone 18 Pro Max or Xiaomi 15?+
Xiaomi 15 is 57g lighter — 249g vs 192g.
Is iPhone 18 Pro Max waterproof?+
iPhone 18 Pro Max has an IP68 rating.
Does Xiaomi 15 support 5G?+
Yes, Xiaomi 15 supports 5G.
Which has a better camera, iPhone 18 Pro Max or Xiaomi 15?+
Xiaomi 15 has a 50 MP main camera vs 48 MP.