Kha'Zix Evolution

First off, your e must be evolved, no matter what. It is a much better escape than his ult. Q evolvation give alot more damage. I usually evolve this one at lvl 16. W evolves give high damage aoe poke and vision. You evolve it first so you can clear faster and gank better. The R evolution was nerfed. It increases the time by a mere one second and use, which is useless. Before people evolved it because there was no stealth delay and it gain 50% reduced damage. They removed that and then buffed his W evolution.

Hope it helps