User blog comment:Rimo13/Rengar and Khazix! Who's the strongest and the most op of these two?!/@comment-5523473-20121020064555

In the hands of most/an average player(s) Rengar will do far more damage and be far more effective, simply cause it isn't difficult to understand how to play him.

Kha'zix is far less durable and has less sustained damage, although his burst is comparable. He has some unique mechanisms and is more fun to play although a lot more difficult to master/play well.

Rengar is getting nerfed, though, and I think Kha'zix may be buffed if his win-rate stays at a similar level (like Syndra).