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 Pro |
|---|---|---|
| Wireless charging | 50 W | 15 W |
| Wired charging | 120 W | 65 W |
| Refresh rate | 120 Hz | 185 Hz |
| RAM | 16 GB | 24 GB |
| Battery capacity | 7500 mAh | 5800 mAh |
| Weight | 211 g | 227 g |
Between the OnePlus 15 and ROG Phone 9 Pro, the OnePlus 15 comes out ahead in wireless charging / wired charging, while the ROG Phone 9 Pro wins on refresh rate / ram. Overall, the OnePlus 15 scores 76.7 and the ROG Phone 9 Pro scores 74.6 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (76.7 vs 74.6). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
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 Pro 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, ram, headphone jack. The single most decisive one: Refresh rate — 54.17% more. 185 Hz vs 120 Hz.
Both ship with comparable main camera, screen size, 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: OnePlus 15 or ASUS - ROG Phone 9 Pro?
OnePlus 15 leads the current Mars Score by 2.1 points.The more useful decision is the trade-off behind that result: compare ram, 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 Pro if…
ASUS - ROG Phone 9 Pro has the measurable edge on refresh rate hz, ram gb, 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 — 10.07% more. 2950000 vs 2680000.
- ▲Water resistance: IP69 (vs IP68).
- ▲Promised OS updates: 5 (vs 3).
Why ASUS - ROG Phone 9 Pro wins
- ▲Refresh rate — 54.17% more. 185 Hz vs 120 Hz.
- ▲RAM — 50.00% more. 24 GB vs 16 GB.
- ▲Has Headphone jack.
Spec comparison
Design
| Spec | OnePlus 15 | ASUS - ROG Phone 9 Pro |
|---|---|---|
| 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 Pro |
|---|---|---|
| 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 Pro |
|---|---|---|
| RAMⓘ | 16 GB | 24 GBlead |
| Storageⓘ | 512 GB | 1024 GBlead |
| AnTuTuⓘ | 2950000lead | 2680000 |
| CPU total clockⓘ | 23.6 GHzlead | 22.8 GHz |
Cameras
| Spec | OnePlus 15 | ASUS - ROG Phone 9 Pro |
|---|---|---|
| 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 Pro |
|---|---|---|
| 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 Pro |
|---|---|---|
| 5G supportⓘ | true | true |
| Headphone jack | false | truelead |
| microSD slot | false | false |
Operating System
| Spec | OnePlus 15 | ASUS - ROG Phone 9 Pro |
|---|---|---|
| OS | Android | Android |
| Promised OS updates | 5 yearslead | 3 years |
Frequently asked
Which has better battery, OnePlus 15 or ROG Phone 9 Pro?+
OnePlus 15 has 29.3% more battery — 7500 mAh vs 5800 mAh.
Which is lighter, OnePlus 15 or ROG Phone 9 Pro?+
OnePlus 15 is 16g lighter — 211g vs 227g.
Is OnePlus 15 waterproof?+
OnePlus 15 has an IP69 rating.
Does ROG Phone 9 Pro support 5G?+
Yes, ROG Phone 9 Pro supports 5G.
Which has more RAM, OnePlus 15 or ROG Phone 9 Pro?+
ROG Phone 9 Pro offers 24GB of RAM.
Which has a better camera, OnePlus 15 or ROG Phone 9 Pro?+
ROG Phone 9 Pro has a 50 MP main camera vs 50 MP.