Samsung Galaxy S21 5G vs Samsung Galaxy S25 Ultra 5G
Looking for an honest Samsung Galaxy S21 5G vs Samsung Galaxy S25 Ultra 5G comparison in 2026? We scored both smartphones on the same six-dimension framework — performance, battery, display, camera, design and value — using identical methodology, so the numbers below are directly comparable. In our overall scoring the Samsung Galaxy S25 Ultra 5G comes out ahead 46/100 to 78/100 — a 32-point gap. The widest gap is in performance, where the Samsung Galaxy S25 Ultra 5G pulls noticeably ahead. On price the Samsung Galaxy S21 5G undercuts the Samsung Galaxy S25 Ultra 5G by 869% ($133.99 vs $1,299), which materially changes the value calculus for budget-conscious buyers.
Samsung
Galaxy S21 5G
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AI Matrix
Powered by Claude AISamsung Galaxy S25 Ultra 5G clearly outperforms the Samsung Galaxy S21 5G in the smartphones category, especially in performance (benchmark 220 vs 75), scoring 78 vs 46. If you want the better overall smartphones, Samsung Galaxy S25 Ultra 5G is the recommended choice.
5 Reasons Why Samsung Galaxy S25 Ultra 5G Is Better
- 1.Larger battery: 5,000mAh vs 4,000mAh (+25%)
- 2.More RAM: 12GB vs 8GB — better multitasking
- 3.More built-in storage: 256GB vs 128GB
- 4.Higher-res main camera: 200MP vs 64MP
- 5.Larger screen: 6.9" vs 6.2"
What are you giving up?
Picking Samsung Galaxy S25 Ultra 5G over Samsung Galaxy S21 5G means trading these off.
You give up
- −$1165 cheaper ($133.99 vs $1299)
- −49g lighter (169g vs 218g)
You gain
- +Larger battery: 5,000mAh vs 4,000mAh
- +More RAM: 12GB vs 8GB
- +More storage: 256GB vs 128GB
- +Higher-res camera: 200MP vs 64MP
- +Better front camera: 12MP vs 10MP