Redmi 3s has a very good and sleek design.it also have curved metallic finish around the screen.it has varient 1.2gb ram and 16gb internal storage.
Both are run on prosessor snapdragon 425chipset and having MIUI 8.1.both varient have same 13MP rare and 5MP front shooting camera.redmi improves his camera performance quite better in this. It has a 5inch screen ips display but not having gorilla glass.it also having important sensers like :
1.gyroscope
2.compass
3.magnetometer.
Etc.
It comes up with 3 colours gold, silver, and dark grey.
It is the best device in this range.
