The mid-range phones with prices below R$ 2,000 are among the most sought by you guys here at TudoCelular Among the most popular ones, are models from Samsung and even Xiaomi that, even increasing the price a little here in Brazil, Is still very much desired. The interest for it increased with the arrival of the new Redmi Note 9 series, which the 7 lineup offered as many nice features And that was not delivered by the 8 series. Some releases, like the Redmi Note 9S, really draw attention, as well as the Galaxy A31 and both having similar price ranges. So let’s put these two phones side by side so you can check which one suits your needs the best. Check now the complete comparison here at Although they follow that design seen on most smartphones, our rivals have several differences. They have a rounded body and a rear with a holographic effect, but the Note 9S is a smooth effect while the A31 has a line that changes the visual texture. Their camera module is rectangular and is centered and much larger on Xiaomi and in the corner and lower on Samsung. And speaking of size, the Note 9S is significantly bigger and heavier than the A31 also having bigger bezels along with the bigger screen. In protection, Xiaomi does better because in addition to the splash-resistant layer it has Gorilla Glass 5 and Samsung has none of that. 
If you want something tougher, you’ll prefer the glossy plastic of the A31 but the glass feels better on the Note 9S although the frame of the two is made of plastic. Biometrics are also different, being below the screen on the Galaxy A31 and on the right side on the Redmi Note 9S so, in the latter, it ends up being much faster but it can hinder left-handers, while the A31 works but not very quickly. At the front there is a drop-shaped notch on the A31 and a hole on the Note 9S, both centered. They are dual-SIM and bring space for both chips and microSD simultaneously. With a superior finish and more protection, the Redmi Note 9S opens the scoreboard with a point. For the screen, technology fight: if you are a fan of more vibrant colors and more intense brightness you’ll be keeping an eye on the A31’s 6.5 “Full HD + Super AMOLED display. If you prefer something a little bigger, the Note 9S has IPS but it has almost 6.7 “and is also Full HD + The maximum brightness of the two is similar, but under the sun, with automatic brightness, the A31 does better in contrast, the Note 9S supports HDR10, allowing you to watch videos with this technology on apps like YouTube and Netflix. If protection is important, not only the Note 9S has Gorilla Glass 5 as well as a film applied from the box. The 20:9 aspect in both and the use of screen-to-body ratio are virtually the same. We know you’re going to sizzle on this one, but being Super AMOLED isn’t all that matters on a display but we also need to consider the extra protection and other technologies, so yes, we have a draw here. Sound and mid-rangers are things that do not usually go hand in hand. Those devices that end up investing in stereo are rare, and not only are both mono here with the Xiaomi model traditionally not even coming with headphones in the box – the A31 is not far behind since the bundled ones are very simple and are the same since the first generation of the Galaxy M series. The quality of the external sound is only reasonable for both, which even reach high volumes, but lacking clarity of sound – however, the weird thing is that the Note 9S does a little better for working better in the middle, although it bursts more in the treble.
 So, the point is the Note 9S that brings a little better external audio. As of good news, these two phones come out of the box with Android 10 already installed and must have an update at least for Android 11. The A31 has a small advantage because it has the Samsung interface in the latest version which is One UI 2.1, while Note 9S comes with MIUI 11, and even knowing that it should receive MIUI 12 soon, it hasn’t arrived yet. Incidentally, MIUI is a little confused on the part of Xiaomi, which sometimes fails to update the version of the device to be only updating the interface. Samsung, on the other hand, even without a very fixed and somewhat messy calendar has delivered two updates on Android. One UI is an interface with many features and settings to personalize the device, including with Night Mode, to make the dark system more pleasing to the eye. The MIUI also has many adjustments and brings a system of themes that please those who like to keep changing the look of smartphones – they are interesting interfaces for those who like to have a lot to move and functions that go beyond the stock Android. In connections, they are well updated – both have dual-band Wi-Fi ac, Bluetooth 5.0, GPS and FM radio. From the previous generation to this the Galaxy A31 lost the digital TV and the Redmi Note 9S brings the extra connection infrared to control electronics. It is a point where they tie, then, point for both. But a technology battle, this time from MediaTek vs. Qualcomm. The A31 brings an interesting Helio P65 but the Note 9S arrives with Snapdragon 720G. For RAM, the two in this test have 4 GB but Xiaomi also offers a 6 GB version for the Note 9S. In storage, both have 128 GB versions, but the one used in the tests here is a 64 GB for the Note 9S – so how did they perform? In benchmarks, you already expected, the 720G overcomes with more than 60% in the score. In our standardized speed tests, the Note 9S performed almost 30% better than its rival Samsung, considering that there is a great lack of system optimization in the A31. 
For games, Redmi’s superiority continued, because even the Galaxy A31 running games well, even being able to be used in HD on PUBG, the Note 9S stands out for being able to run some titles heavy at up to 60 FPS, something that you don’t see much in intermediate Androids, using the Game Turbo 2.0 feature. So, a clear point here for the Redmi Note 9S. In one of the few similarities, they have the same battery size – 5,000 mAh. And that did mean numbers that were close to our battery tests, but with a certain advantage for Note 9S. This Xiaomi device reached almost 26 hours of autonomy, while the A31 presented an hour less. The same goes for the screen duration of approximately thirteen and a half hours on the Note 9S and twelve and a half hours on the A31. In the recharge, we have differences, because the charger that comes in the Samsung cell phone case is 15-Watt whereas Note 9S is 22.5-Watt, and that gives an advantage to the latter. The A31 spends half an hour more on the plug, arriving at two hours and 15 minutes. And then we give another point to the Redmi Note 9S. With an almost equal set of cameras in this battle, we may even notice here a trend in today’s intermediaries – there are four cameras with the most common being used. So, on the Galaxy A31, we have the main sensor of 48 MP, aperture f / 2.0 and PDAF an 8 MP ultra-wide, a 5 MP macro, and a 5 MP depth sensor. On the Note 9S, we have a 48 MP main sensor with a slightly better aperture, f / 1.8 and the PDAF, an 8 MP ultra-wide, a 5 MP macro, and a 2 MP depth sensor. The main lens already comes with a difference that can be attributed to the different processors that we have here – in good light the Galaxy A31 makes cool shots, but the lighting just falls so that quality is also lost. At night, both will be bad, due to their characteristics, but for medium and good lighting the Note 9S can do better, with less noise and better dynamic range in addition to bringing good color balance and a high level of detail. There is no doubt about the macro, and the best is the Note 9S, which not only has quality but also has autofocus, being one of the best we’re seeing in that segment. Photos with A31 in this mode are not bad, but they need more light and the focus is fixed at 3 to 5 cm. Ultra-wide also gives an advantage to the Note 9S, which makes good quality photos with little change When compared to the main sensor, however, at night it also cannot work miracles just like the A31. So the point is for the Redmi Note 9S. In the videos, only the Note 9S records in 4K, which is not good news for Samsung. Full HD recording does not include 60 fps on the A31 and this is also a limitation and even though the electronic stabilization only appears in Full HD on the Note 9S, only it has this and makes it shake less when recording. As a whole, the Note 9S allows recording with other sensors and has a better quality but when it comes to capturing the sound, it is poor, and the A31 does better at that, but only at that. At night, the recording with both is very bad. Another point then for the Note 9S on cameras. Finally, the front camera of the A31 has a 20 MP sensor and f / 2.2 aperture, while the Note 9S it has 16 MP and f / 2.5 aperture, which is less promising. And it is possible to say that the Galaxy A31 manages to do better in this part. Your photos presented a slightly better definition, especially where it is most required such as indoors and at night. Portrait Mode doesn’t get the details right as much as on the Note 9S, but it kept better the contrast of the images, so we have here, look, a point for the Galaxy A31. None of them arrived at a fair low price – we haven’t seen it here in Brazil. The Galaxy A31 lost features in relation to the Galaxy A30 and arrived even more expensive, costing R$ 1,999 and it even increased to up to R$ 2,399 sometime later. 
The Note 9S arrived in Brazil at an expected high price of R$ 2,800. Luckily, these two phones that face each other had a low price and continue different from some other models in the current situation, which we even has shown here in the comparatives. The A31 is already getting close to R$ 1,500 in specific deals and the Note 9S had a drop of almost R $ 1,000 and is R$ 1,900, but that in the 64 GB version, being much more expensive practically R$ 1,000 more expensive, in the version with more space. The two should still experience price drops by the end of the year and if there is a dollar price drop We can even consider the imported version for the Xiaomi model. The price of the A31 is much more attractive, but it had so few points in comparison who will wait for a Note 9S deal to make a more cost-effective purchase, so that point, the last one in the comparison, goes to the Note 9S. Although they have the same battery and a similar set of cameras, we have two smartphones very different here and these diversities are largely due to the different processors from the manufacturers – the Galaxy A31 is selling very well, but if you can spend a little more go from Redmi Note 9S or consider a Galaxy A51, which has also had a good price drop and it’s just as popular as an option. Did you agree with the result of our comparison? Does the Note 9S get that easy from the Galaxy A31 or do you think this Samsung has more value in this battle?

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