Galaxy S25 Ultra vs 15

Phone 1

Phone 2

Winner

Samsung Galaxy S25 Ultra

The Galaxy S25 Ultra wins this one, taking software longevity and camera decisively. Against the 15 it's also the sounder buy at $13.34 per month of safe use.

Value Score: Galaxy S25 Ultra 75 · 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.

Samsung Galaxy S25 Ultra $902

Safe to buy$13.34/mo

2025◆ Buy-by Feb 20302032

Xiaomi 15 $750

Safe to buy$16.89/mo

2025◆ Buy-by Mar 20282030

Category by category

Display

Galaxy S25 Ultra 10015 90

The Galaxy S25 Ultra's screen is the better one — 6.9-inch dynamic ltpo amoled 2x, qhd+, 1–120hz, up to 2600 nits.

Performance

Galaxy S25 Ultra 9815 98

Performance is a wash — same chip tier.

Camera

Galaxy S25 Ultra 9615 79

The Galaxy S25 Ultra has the stronger camera system (4 real rear lenses vs 3).

Battery

Galaxy S25 Ultra 8015 85

5,240mAh vs 5,000mAh — the 15 lasts longer between charges.

Software longevity

Galaxy S25 Ultra 8115 53

The Galaxy S25 Ultra is supported until Feb 2032 — 23 months longer than the 15.

Value

Galaxy S25 Ultra 7515 67

Overall value goes to the Galaxy S25 Ultra at $13.34 per month of safe use.

Full spec table

Spec	Galaxy S25 Ultra	15
Price (street)	$902	$750
Display	6.9-inch Dynamic LTPO AMOLED 2X, QHD+, 1–120Hz, up to 2600 nits	6.36-inch CrystalRes AMOLED, 2670×1200 (460 ppi), 1–120Hz LTPO, up to 3200 nits peak, Dolby Vision/HDR10+
Chipset	Snapdragon 8 Elite for Galaxy	Snapdragon 8 Elite
RAM	12GB	12GB
Storage	256GB/512GB/1TB	256GB/512GB
Battery	5,000 mAh	5,240 mAh
Charging	45W wired (65% in 30 min), 15W wireless (Qi2 Ready), 4.5W reverse wireless	90W wired, 50W wireless
Rear cameras	200MP main, 50MP ultra-wide, 10MP telephoto 3x, 50MP periscope 5x	50MP main (Light Fusion 900, f/1.62), 50MP ultra-wide, 50MP telephoto (Leica 60mm floating)
Dimensions	162.8 × 77.6 × 8.2 mm	152.3 × 71.2 × 8.08 mm
Weight	218 g	191 g
Water resistance	IP68	IP68
Supported until	Feb 2032	Mar 2030

Galaxy S25 Ultra 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.