Samsung Galaxy S21 5G vs Samsung Galaxy S27 Ultra

Compare Samsung Galaxy S21 5G vs Samsung Galaxy S27 Ultra side by side: Exynos 2100 / Snapdragon 888 5G (5 nm) vs Qualcomm Snapdragon 8 Elite Gen 2 for…

Samsung

Galaxy S27 Ultra

$1,399

17categories won

3 categories tied · 22 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 S21 5G, 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 S21 5G 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 S21 5G

Galaxy S21 5G provides a sharper value proposition, coming in at $799 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 S21 5G vs Galaxy S27 Ultra: specifications compared

Display

Display comparison between the Samsung Galaxy S21 5G, Samsung Galaxy S27 Ultra
Specification	Galaxy S21 5G	Galaxy S27 Ultra
Screen size	6.2"	6.9"
Resolution	1080 x 2400	1440 x 3120Winner
Pixel density	424 ppi	498 ppiWinner
Refresh rate	120 Hz	120 Hz
Peak brightness	1300 nits	3500 nitsWinner

Performance

Performance comparison between the Samsung Galaxy S21 5G, Samsung Galaxy S27 Ultra
Specification	Galaxy S21 5G	Galaxy S27 Ultra
Chipset	Exynos 2100 / Snapdragon 888 5G (5 nm)	Qualcomm Snapdragon 8 Elite Gen 2 for Galaxy
Process node	5 nm	2 nmWinner
AnTuTu score	820,000	3,200,000Winner
Geekbench multi	3720	10800Winner
Maximum RAM	8 GB	24 GBWinner
Maximum storage	128GB	2TBWinner

Camera

Camera comparison between the Samsung Galaxy S21 5G, Samsung Galaxy S27 Ultra
Specification	Galaxy S21 5G	Galaxy S27 Ultra
Main sensor	12 MP	200 MPWinner
Rear cameras	3	4Winner
Optical zoom	3x	3x
Ultrawide	12 MP	50 MPWinner
Selfie camera	10 MP	16 MPWinner
Max video	8K at 24fps / 4K at 60fps	8K at 30fps / 4K at 120fps

Battery and charging

Battery and charging comparison between the Samsung Galaxy S21 5G, Samsung Galaxy S27 Ultra
Specification	Galaxy S21 5G	Galaxy S27 Ultra
Capacity	4,000 mAh	5,500 mAhWinner
Wired charging	25 W	65 WWinner
Wireless charging	15 W	25 WWinner

Design

Design comparison between the Samsung Galaxy S21 5G, Samsung Galaxy S27 Ultra
Specification	Galaxy S21 5G	Galaxy S27 Ultra
Weight	169 gWinner	218 g
Thickness	7.9 mm	8.2 mm
Water resistance	IP68	IP68
Build	Aluminum frame, glastic back, Gorilla Glass Victus front	Grade 5 Titanium frame, Ceramic Glass front and back

Software and support

Software and support comparison between the Samsung Galaxy S21 5G, Samsung Galaxy S27 Ultra
Specification	Galaxy S21 5G	Galaxy S27 Ultra
Operating system	Android 11	Android 17
OS updates	4 years	7 yearsWinner
Security updates	5 years	7 yearsWinner

Connectivity and value

Connectivity and value comparison between the Samsung Galaxy S21 5G, Samsung Galaxy S27 Ultra
Specification	Galaxy S21 5G	Galaxy S27 Ultra
5G	Yes	Yes
Wi-Fi	Wi-Fi 6 (802.11ax)	Wi-Fi 7 (802.11be, tri-band 2.4/5/6GHz, 320MHz bandwidth)
Storage expansion	None	None
3.5mm jack	No	No
Launch price	$799Winner	$1,399