Comparison of the Redmi Note 9 versus the Samsung Galaxy A21s

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The mid-range has undoubtedly become the great battlefield between the main mobile manufacturers. It is where the bulk of sales take place, especially since they increasingly offer better specifications for a tighter price. It is the case of Samsung Galaxy A21s and the Xiaomi Redmi Note 9.

We are facing two of the best-selling phones in the mid-range, in fact the Samsung is the best-selling in the range of the Korean firm in recent months, so it will have to have something to hook users.

Screen and dimensions

We are facing two terminals of similar size, in the case of the Redmi with a screen of 6.53 inches and Full HD + resolution. While the Samsung is quite similar in size, with 6.5 inch although with less resolution, in this case HD+.

xiaomi redmi note 9 no background

The two screens have a hole in the corner. The dimensions of the Redmi are 162.3 x 77.2 x 8.9 mm and it weighs 199 grams, while the Samsung measures 163.7 x 75.3 x 8.9 mm and its weight is 192 grams.

Samsung Galaxy A21s offer

Performance and memory

Here each one has a different processor, the Redmi with the MediaTek Helio G85, made in 12nm, and the Samsung a Exynos 850, made in 8nm. Both have similar performance, although that of the Koreans is more efficient.

mediatek helio

The RAM memory available in the versions we have looked at are 3GB on both phones. In storage the Redmi has 64GB and the Samsung 32GB, in both cases expandable by microSD cards.

samsung exynos radeon

Photo camera

Here we also have enough equality, with quad cameras in both cases. They also have with the same configuration of sensors, starting from the main one with 48 megapixels, which is accompanied by an 8 megapixel ultra wide angle, 2 megapixel macro and another 2 megapixel deep.

Xiaomi Redmi Note 9 Camera

Ahead, within their respective screen holes, there are 13 megapixel cameras in both cases, so equality in this aspect is maximum. Something that also happens with the battery.

Samsung Galaxy A21s

Battery and connectivity

Both have a 5000mAh battery, in the case of the Redmi with fast charging of 18W, and in the Samsung of 15W. Both have a USB type C connector, NFC for making mobile payments, Bluetooth 5.0 and Wi-Fi 802.11 a / b / g / n / ac.

Redmi Note 9S

The fingerprint reader of both is placed behind, and in the case of Xiaomi we also have FM Radioas well as an infrared port. The Redmi has Android 10 under the MIUI 11 layer, while the Samsung also enjoys Android 10 in this case under the One UI 2.0 layer.

Samsung Galaxy A21s

Price and conclusion

They are undoubtedly two phones with a fairly similar price, although in this case there are some factors that are determining for opt for him Redmi Note 9. As are its screen with more resolution, and double the internal storage, taking into account its price of 179 euros.


In the case of the Samsung Galaxy A21s we have a mobile with a processor made in a more modern technology, but we have less storage and only HD + resolution, although it is somewhat cheaper, and we can buy it for 163 euros. A priori it is better to buy the Redmi, because the resolution factor is determining. However, Samsung is also a great choice, especially since we are talking about one of the premium brands par excellence.

Written by Jorge Sanz

November 14, 2020

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