WhatsApp sucks with it many issues,kik is decent but needs features,line is great but what about voip? Viber is working but not ios/android working,Kakao talk basically needs work
I think Nokia and Whatsapp are working on an update. I have no idea when it is to be released.
In India WeChat is decent enough but not excellent. Viber is working fine for me, it behaves weird though. I don't seem to able to receive calls properly.
WeChat is good... WhatsApp Needs rapid update (an update is coming though .. probably beginning of july or end of June).. Kik also needs an update as it doesn't have live tile support (last update was April 2012 or something! ) .. Viber will update it's app on wp8 in the next 2 months !!