Rengar vs Kha'Zix: Who would win?

Outside of gameplay, who do you reckon would actually win in a battle to the death? Rengar is fast and stealthy, but I definitely think Rengar has much more strength over Kha'Zix too. Kha on the other hand might have a little faster reactions and might be a little more deft but I don't think it'd be enough to completely stomp Rengar, I think Rengar would just overpower him - much like a heavyweight fighter vs a lightweight.
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