I have bought almost every Xiaomi phone in the past and they have not disappointed me ever. That is why I bought Redmi 3s Prime.
There are lots of features in the phone and the most highlighted one is the battery which is 4100 Mah and last almost 2-3 days of moderate usage.
It has a 720p resolution display and it is a good 720p display, the images are clear and smooth. The con of the is also that it has a 720p display and not 1080p display, other than that everything else is perfect.
I would recommand this phone who travels a lot and dont have time for charging friquiently.
This phone also supports quick charge 2.0 but the charger given by the company is not a quick charger. You should buy a third party quick charge enabled charger.
Overall it is a good budget phone and you should not think before buying this phone.