Redmi 3s is upgraded vesrion of redmi 2 prime
3s has 13 mp camera instead of 8mp
5 mp front camera instead of 2 mp
Also it is 5 inch display instead of 4.7 inch
Also has bigger battery 4100 mah instead of 2200
In same price rate of RS 7k in india
And also has android 6.0 marshmallow in it.
So this is a better option for everyone.