Title says it all.
well we cant really vote for you because it have to be your choice and it depends on your play style
you want to charge from the left side to the right side in the map or you want to ambush some one like rengar almost 2 hit KO
Dunno am scared when Nocturne uses his Ulti...u dunno who's going down xDD
Kha is one of the best assassins...up to you. In my opinions both are great with jumping to enemies...big range.
Sidekick 4 you
I think Nocturne is a bit more better for you he is a lot of more user friendly than Kha'Zix then you are playing as Kha'Zix you need to learn all tricks and be all the time easily alerted.
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