Galaxy S23 Ultra vs Redmi Note 15 5G

Phone 1

Phone 2

Winner

Xiaomi Redmi Note 15 5G

Lifespan decides this one: the Redmi Note 15 5G is supported until Dec 2029 at $6.03 per month of safe use, while the Galaxy S23 Ultra runs out in Feb 2028 ($16.94/month). On a which-lasts-longer question, that's not a tie — it's the whole answer.

Value Score: Galaxy S23 Ultra 76 · Redmi Note 15 5G 71 — 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 S23 Ultra $339

Buy with care$16.94/mo

2023◆ Buy-by Feb 20262028

Xiaomi Redmi Note 15 5G $250

Safe to buy$6.03/mo

2025◆ Buy-by Dec 20272029

Category by category

Display

Galaxy S23 Ultra 90Redmi Note 15 5G 80

The Galaxy S23 Ultra's screen is the better one — 6.8-inch dynamic amoled 2x, qhd+, ltpo 1–120hz, 1750 nits peak.

Performance

Galaxy S23 Ultra 85Redmi Note 15 5G 48

The Galaxy S23 Ultra's Snapdragon 8 Gen 2 for Galaxy is simply the faster chip.

Camera

Galaxy S23 Ultra 96Redmi Note 15 5G 67

The Galaxy S23 Ultra has the stronger camera system (4 real rear lenses vs 2).

Battery

Galaxy S23 Ultra 80Redmi Note 15 5G 90

5,520mAh vs 5,000mAh — the Redmi Note 15 5G lasts longer between charges.

Software longevity

Galaxy S23 Ultra 24Redmi Note 15 5G 49

The Redmi Note 15 5G is supported until Dec 2029 — 21 months longer than the Galaxy S23 Ultra.

Value

Galaxy S23 Ultra 76Redmi Note 15 5G 71

Overall value goes to the Galaxy S23 Ultra at $16.94 per month of safe use.

Full spec table

Spec	Galaxy S23 Ultra	Redmi Note 15 5G
Price (street)	$339	$250
Display	6.8-inch Dynamic AMOLED 2X, QHD+, LTPO 1–120Hz, 1750 nits peak	6.77-inch AMOLED, FHD+, 120Hz, 3200 nits peak
Chipset	Snapdragon 8 Gen 2 for Galaxy	Qualcomm Snapdragon 6 Gen 3
RAM	8GB/12GB	8GB
Storage	256GB/512GB/1TB	256GB/512GB
Battery	5,000 mAh	5,520 mAh
Charging	45W wired, 15W wireless, 4.5W reverse wireless	45W wired
Rear cameras	200MP main, 12MP ultra-wide, 10MP telephoto 3x, 10MP periscope 10x	108MP main, 8MP ultra-wide
Dimensions	163.4 × 78.1 × 8.9 mm	164 × 75.4 × 7.4 mm
Weight	234 g	178 g
Water resistance	IP68	IP66
Supported until	Feb 2028	Dec 2029

Galaxy S23 Ultra full verdict →Redmi Note 15 5G 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.