ROG Phone 9 vs 15 Ultra

Phone 1

Phone 2

Winner

Xiaomi 15 Ultra

The 15 Ultra wins this one, taking display and camera decisively. Against the ROG Phone 9 it's also the sounder buy at $30.40 per month of safe use.

Value Score: ROG Phone 9 58 · 15 Ultra 65 — methodology

The lifespan decider

When specs are close, support length decides it — this is what each phone costs per month of safe use.

Asus ROG Phone 9 $999

Safe to buy$24.35/mo

2024◆ Buy-by Nov 20272029

Xiaomi 15 Ultra $1350

Safe to buy$30.40/mo

2025◆ Buy-by Mar 20282030

Category by category

Display

ROG Phone 9 6015 Ultra 100

The 15 Ultra's screen is the better one — 6.73-inch 2k (1440×3200) ltpo amoled, 1–120hz, up to 3200 nits peak.

Performance

ROG Phone 9 9815 Ultra 98

Performance is a wash — same chip tier.

Camera

ROG Phone 9 6715 Ultra 96

The 15 Ultra has the stronger camera system (4 real rear lenses vs 2).

Battery

ROG Phone 9 9615 Ultra 88

5,800mAh vs 5,410mAh — the ROG Phone 9 lasts longer between charges.

Software longevity

ROG Phone 9 4915 Ultra 53

The 15 Ultra is supported until Mar 2030 — 3 months longer than the ROG Phone 9.

Value

ROG Phone 9 5815 Ultra 65

Overall value goes to the 15 Ultra at $30.40 per month of safe use.

Full spec table

Spec	ROG Phone 9	15 Ultra
Price (street)	$999	$1350
Display	6.78-inch LTPO AMOLED, 1080x2400, 185Hz	6.73-inch 2K (1440×3200) LTPO AMOLED, 1–120Hz, up to 3200 nits peak
Chipset	Qualcomm Snapdragon 8 Elite	Qualcomm Snapdragon 8 Elite (3nm)
RAM	12GB/16GB	16GB
Storage	256GB/512GB	512GB/1TB
Battery	5,800 mAh	5,410 mAh
Charging	65W wired, 15W wireless	90W wired, 80W wireless
Rear cameras	50MP main, 13MP ultra-wide, 5MP macro	50MP main, 50MP ultra-wide, 50MP telephoto (70mm floating), 200MP periscope telephoto
Dimensions	163.8 × 76.8 × 8.9 mm	161.3 × 75.3 × 9.35 mm
Weight	227 g	226 g
Water resistance	IP68	IP68
Supported until	Nov 2029	Mar 2030

ROG Phone 9 full verdict →15 Ultra full verdict →Longevity master board →

Scores and verdicts are computed from our verified database — see exactly how. Specs from manufacturer documentation; prices reflect major US retailers.