ROG Phone 8 vs 15

Phone 1

Phone 2

Winner

Xiaomi 15

Lifespan decides this one: the 15 is supported until Mar 2030 at $16.81 per month of safe use, while the ROG Phone 8 runs out in Jan 2029 ($27.24/month). On a which-lasts-longer question, that's not a tie — it's the whole answer.

Value Score: ROG Phone 8 60 · 15 67 — 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 8 $850

Buy with care$27.24/mo

2024◆ Buy-by Jan 20272029

Xiaomi 15 $750

Safe to buy$16.81/mo

2025◆ Buy-by Mar 20282030

Category by category

Display

ROG Phone 8 8015 90

The 15's screen is the better one — 6.36-inch crystalres amoled, 2670×1200 (460 ppi), 1–120hz ltpo, up to 3200 nits peak, dolby vision/hdr10+.

Performance

ROG Phone 8 9215 98

The 15's Snapdragon 8 Elite is simply the faster chip.

Camera

ROG Phone 8 7915 79

Camera systems are comparable on paper — pick by sample photos.

Battery

ROG Phone 8 9015 85

5,500mAh vs 5,240mAh — the ROG Phone 8 lasts longer between charges.

Software longevity

ROG Phone 8 3715 53

The 15 is supported until Mar 2030 — 13 months longer than the ROG Phone 8.

Value

ROG Phone 8 6015 67

Overall value goes to the 15 at $16.81 per month of safe use.

Full spec table

Spec	ROG Phone 8	15
Price (street)	$850	$750
Display	6.78-inch LTPO AMOLED, 1080x2400, 165Hz	6.36-inch CrystalRes AMOLED, 2670×1200 (460 ppi), 1–120Hz LTPO, up to 3200 nits peak, Dolby Vision/HDR10+
Chipset	Qualcomm Snapdragon 8 Gen 3	Snapdragon 8 Elite
RAM	12GB/16GB	12GB
Storage	256GB/512GB	256GB/512GB
Battery	5,500 mAh	5,240 mAh
Charging	65W wired, 15W wireless	90W wired, 50W wireless
Rear cameras	50MP main, 13MP ultra-wide, 32MP telephoto 3x	50MP main (Light Fusion 900, f/1.62), 50MP ultra-wide, 50MP telephoto (Leica 60mm floating)
Dimensions	163.8 × 76.8 × 8.9 mm	152.3 × 71.2 × 8.08 mm
Weight	225 g	191 g
Water resistance	IP68	IP68
Supported until	Jan 2029	Mar 2030

ROG Phone 8 full verdict →15 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.