We have purchased Activa 4G for my sister just before 2 months. It is having mileage of 50-55 kmpl. It is available in different colors. We have purchased blue color.
The basic diffrence between Activa 3G and 4G is that it is having BS4 engine. Otherwise rest of the features are same.
It is very comfortable both for man and woman. It is having very good rear space. It is having very good road grip.
Honda is very reliable brand. Also it is having very less maintenance cost. In my view, It is the best choice among all mopeds.