I have been using Wechat since a few months now. Going by whatsapps popularity, not many people are active on Wechat.
But Wechat too has some good features. The voice calling feature was introduced here much before Whatsapp started.
The smileys available here are very cute and interesting to use. With the regular Wechat reward contests going on, I am also enjoying the free recharge and shopping vouchers by just sending stickers to my friends.
But would like to mention, the offers available last month were not too great. Some of the shopping vouchers are not applicable for all the products. But yes, as far as the chatting application goes, it is a good one. This can be surely used as a good alternative to Whatsapp.