Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | OnePlus 15 | ASUS - ROG Phone 9 |
|---|---|---|
| Wireless charging | 50 W | 15 W |
| Wired charging | 120 W | 65 W |
| Refresh rate | 120 Hz | 185 Hz |
| Battery capacity | 7500 mAh | 5800 mAh |
| Weight | 211 g | 227 g |
| Pixel density | 450 ppi | 388 ppi |
Between the OnePlus 15 and ROG Phone 9, the OnePlus 15 comes out ahead in wireless charging / wired charging, while the ROG Phone 9 wins on refresh rate / headphone jack. Overall, the OnePlus 15 scores 76.7 and the ROG Phone 9 scores 72.4 on our Mars Score.
Which should you buy?
The OnePlus 15 edges ahead on the Mars Score (76.7 vs 72.4), but the 4.3-point gap is small enough that the right pick comes down to which spec advantages matter to you.
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. The biggest gaps in its favor are wireless charging, wired charging, battery capacity, among others. The single most decisive one: Wireless charging — 233.33% more. 50 W vs 15 W.
Pick the ROG Phone 9 if the display is what you stare at all day — refresh rate, brightness, or sharpness is where the difference will be most visible. Its strongest claims are refresh rate, headphone jack. The single most decisive one: Refresh rate — 54.17% more. 185 Hz vs 120 Hz.
Both ship with comparable ram, main camera, screen size, 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: OnePlus 15 or ASUS - ROG Phone 9?
OnePlus 15 leads the current Mars Score by 4.3 points.The more useful decision is the trade-off behind that result: compare pixel density, battery capacity against the way you will actually use the product.
Choose OnePlus 15 if…
OnePlus 15 has the measurable edge on wireless charging w, wired charging w, battery capacity mah.
Choose ASUS - ROG Phone 9 if…
ASUS - ROG Phone 9 has the measurable edge on refresh rate hz, has headphone jack.
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 OnePlus 15 wins
- ▲Wireless charging — 233.33% more. 50 W vs 15 W.
- ▲Wired charging — 84.62% more. 120 W vs 65 W.
- ▲Battery capacity — 29.31% more. 7500 mAh vs 5800 mAh.
- ▲Weight — 16.00 g less. 211 vs 227.
- ▲Pixel density — 15.98% more. 450 ppi vs 388 ppi.
- ▲AnTuTu — 14.34% more. 2950000 vs 2580000.
- ▲Water resistance: IP69 (vs IP68).
- ▲Promised OS updates: 5 (vs 3).
Why ASUS - ROG Phone 9 wins
- ▲Refresh rate — 54.17% more. 185 Hz vs 120 Hz.
- ▲Has Headphone jack.
Spec comparison
Design
| Spec | OnePlus 15 | ASUS - ROG Phone 9 |
|---|---|---|
| Weight | 211 glead | 227 g |
| Thickness | 8.3 mmlead | 8.9 mm |
| Water resistanceⓘ | IP69lead | IP68 |
| Form factor | bar | bar |
Display
| Spec | OnePlus 15 | ASUS - ROG Phone 9 |
|---|---|---|
| Screen size | 6.78 " | 6.78 " |
| Pixel densityⓘ | 450 ppilead | 388 ppi |
| Refresh rateⓘ | 120 Hz | 185 Hzlead |
| Peak brightnessⓘ | 4500 nitslead | 2500 nits |
Performance
| Spec | OnePlus 15 | ASUS - ROG Phone 9 |
|---|---|---|
| RAMⓘ | 16 GB | 16 GB |
| Storageⓘ | 512 GB | 512 GB |
| AnTuTuⓘ | 2950000lead | 2580000 |
| CPU total clockⓘ | 23.6 GHzlead | 22.0 GHz |
Cameras
| Spec | OnePlus 15 | ASUS - ROG Phone 9 |
|---|---|---|
| Main cameraⓘ | 50 MP | 50 MP |
| Front camera | 32 MP | 32 MP |
| Optical image stabilizationⓘ | true | true |
Battery
| Spec | OnePlus 15 | ASUS - ROG Phone 9 |
|---|---|---|
| Battery capacityⓘ | 7500 mAhlead | 5800 mAh |
| Wired chargingⓘ | 120 Wlead | 65 W |
| Wireless chargingⓘ | 50 Wlead | 15 W |
Connectivity
| Spec | OnePlus 15 | ASUS - ROG Phone 9 |
|---|---|---|
| 5G supportⓘ | true | true |
| Headphone jack | false | truelead |
| microSD slot | false | false |
Operating System
| Spec | OnePlus 15 | ASUS - ROG Phone 9 |
|---|---|---|
| OS | Android | Android |
| Promised OS updates | 5 yearslead | 3 years |
Frequently asked
Which has better battery, OnePlus 15 or ROG Phone 9?+
OnePlus 15 has 29.3% more battery — 7500 mAh vs 5800 mAh.
Which is lighter, OnePlus 15 or ROG Phone 9?+
OnePlus 15 is 16g lighter — 211g vs 227g.
Is OnePlus 15 waterproof?+
OnePlus 15 has an IP69 rating.
Does ROG Phone 9 support 5G?+
Yes, ROG Phone 9 supports 5G.
Which has a better camera, OnePlus 15 or ROG Phone 9?+
ROG Phone 9 has a 50 MP main camera vs 50 MP.