PhoneLifespan

ROG Phone 9 vs 15 Pro

vs

Winner

Xiaomi 15 Pro

The 15 Pro wins this one, taking display and software longevity decisively. Against the ROG Phone 9 it's also the sounder buy at $12.37 per month of safe use.

Value Score: ROG Phone 9 58 · 15 Pro 74 — 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$24.23/mo
2024◆ Buy-by Nov 20272029
Xiaomi 15 Pro $650
Safe to buy$12.37/mo
2024◆ Buy-by Oct 20282030

Category by category

Display
ROG Phone 9 6015 Pro 90

The 15 Pro's screen is the better one — 6.73-inch ltpo amoled, 3200 x 1440, 120hz.

Performance
ROG Phone 9 9815 Pro 98

Performance is a wash — same chip tier.

Camera
ROG Phone 9 6715 Pro 79

The 15 Pro has the stronger camera system (3 real rear lenses vs 2).

Battery
ROG Phone 9 9615 Pro 100

6,100mAh vs 5,800mAh — the 15 Pro lasts longer between charges.

Software longevity
ROG Phone 9 4915 Pro 63

The 15 Pro is supported until Oct 2030 — 11 months longer than the ROG Phone 9.

Value
ROG Phone 9 5815 Pro 74

Overall value goes to the 15 Pro at $12.37 per month of safe use.

Full spec table
SpecROG Phone 915 Pro
Price (street)$999$650
Display6.78-inch LTPO AMOLED, 1080x2400, 185Hz6.73-inch LTPO AMOLED, 3200 x 1440, 120Hz
ChipsetQualcomm Snapdragon 8 EliteQualcomm Snapdragon 8 Elite
RAM12GB/16GB12GB/16GB
Storage256GB/512GB256GB/512GB/1TB
Battery5,800 mAh6,100 mAh
Charging65W wired, 15W wireless90W wired, 50W wireless
Rear cameras50MP main, 13MP ultra-wide, 5MP macro50MP main, 50MP ultra-wide, 50MP telephoto 5x
Dimensions163.8 × 76.8 × 8.9 mm161.3 × 74.6 × 8.4 mm
Weight227 g213 g
Water resistanceIP68IP68
Supported untilNov 2029Oct 2030
ROG Phone 9 full verdict →15 Pro 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.