Samsung Galaxy S25 Slim vs Samsung Galaxy S27 Ultra

Compare Samsung Galaxy S25 Slim vs Samsung Galaxy S27 Ultra side by side: Qualcomm Snapdragon 8 Elite for Galaxy vs Qualcomm Snapdragon 8 Elite Gen 2 for…

Samsung

Galaxy S27 Ultra

$1,399

12categories won

5 categories tied · 21 scored in total · add a third phone

Information Gain

Which one wins?

MxMob Algorithmic Verdict

Samsung Galaxy S27 Ultra takes the overall win

Overall Pick

The Samsung Galaxy S27 Ultra proves superior overall against the Samsung Galaxy S25 Slim, outperforming on gaming and photography. In camera testing, the Galaxy S27 Ultra leads with superior optics, while battery endurance leans towards the Galaxy S27 Ultra. Choose the Galaxy S27 Ultra if you want the highest performance ceiling, or opt for the Galaxy S25 Slim if its lower retail price better fit your budget.

🔋 BatteryGalaxy S27 Ultra

Galaxy S27 Ultra takes battery honors offering 5,500 mAh alongside 65W charging.

🎮 GamingGalaxy S27 Ultra

Galaxy S27 Ultra provides greater sustained gaming output with its Qualcomm Snapdragon 8 Elite Gen 2 for Galaxy and 24GB RAM.

📸 CameraGalaxy S27 Ultra

Galaxy S27 Ultra takes photography with 200MP optics and 3x optical telephoto capabilities.

🏷️ ValueGalaxy S25 Slim

Galaxy S25 Slim provides a sharper value proposition, coming in at $999 vs $1399.

Category verdicts are computed algorithmically from verified technical specifications and hardware benchmarks. Rows where neither figure is objectively better — screen size preference, operating system choice, aesthetic build materials — are displayed for direct reference without scoring bias.

Galaxy S25 Slim vs Galaxy S27 Ultra: specifications compared

Display

Display comparison between the Samsung Galaxy S25 Slim, Samsung Galaxy S27 Ultra
Specification	Galaxy S25 Slim	Galaxy S27 Ultra
Screen size	6.66"	6.9"
Resolution	1440 x 3120	1440 x 3120
Pixel density	516 ppiWinner	498 ppi
Refresh rate	120 Hz	120 Hz
Peak brightness	3000 nits	3500 nitsWinner

Performance

Performance comparison between the Samsung Galaxy S25 Slim, Samsung Galaxy S27 Ultra
Specification	Galaxy S25 Slim	Galaxy S27 Ultra
Chipset	Qualcomm Snapdragon 8 Elite for Galaxy	Qualcomm Snapdragon 8 Elite Gen 2 for Galaxy
Process node	3 nm	2 nmWinner
AnTuTu score	2,400,000	3,200,000Winner
Geekbench multi	8900	10800Winner
Maximum RAM	16 GB	24 GBWinner
Maximum storage	512GB	2TBWinner

Camera

Camera comparison between the Samsung Galaxy S25 Slim, Samsung Galaxy S27 Ultra
Specification	Galaxy S25 Slim	Galaxy S27 Ultra
Main sensor	50 MP	200 MPWinner
Rear cameras	2	4Winner
Optical zoom	—	3x
Ultrawide	12 MP	50 MPWinner
Selfie camera	16 MP	16 MP
Max video	8K at 30fps / 4K at 120fps	8K at 30fps / 4K at 120fps

Battery and charging

Battery and charging comparison between the Samsung Galaxy S25 Slim, Samsung Galaxy S27 Ultra
Specification	Galaxy S25 Slim	Galaxy S27 Ultra
Capacity	4,400 mAh	5,500 mAhWinner
Wired charging	45 W	65 WWinner
Wireless charging	15 W	25 WWinner

Design

Design comparison between the Samsung Galaxy S25 Slim, Samsung Galaxy S27 Ultra
Specification	Galaxy S25 Slim	Galaxy S27 Ultra
Weight	168 gWinner	218 g
Thickness	6.6 mmWinner	8.2 mm
Water resistance	IP68	IP68
Build	Grade 5 Titanium frame, Gorilla Glass Armor 2 front, matte glass back	Grade 5 Titanium frame, Ceramic Glass front and back

Software and support

Software and support comparison between the Samsung Galaxy S25 Slim, Samsung Galaxy S27 Ultra
Specification	Galaxy S25 Slim	Galaxy S27 Ultra
Operating system	Android 15	Android 17
OS updates	7 years	7 years
Security updates	7 years	7 years

Connectivity and value

Connectivity and value comparison between the Samsung Galaxy S25 Slim, Samsung Galaxy S27 Ultra
Specification	Galaxy S25 Slim	Galaxy S27 Ultra
5G	Yes	Yes
Wi-Fi	Wi-Fi 7 (802.11be, tri-band 2.4/5/6GHz, 320MHz bandwidth)	Wi-Fi 7 (802.11be, tri-band 2.4/5/6GHz, 320MHz bandwidth)
Storage expansion	None	None
3.5mm jack	No	No
Launch price	$999Winner	$1,399