Which one is the best at top and why?
Which one is good for ranked 5v5's?
Rengar has ranged poke, an amazing gap closer, free stats, doesn't use mana, better sustain, insta-stealth to get away from ganks... Rengar's kit is really good for top lane.
Rengar is the best, and right now, I don't think it's close. In ranked 5's, Rengar is the easy pick, IMO. His build is really strong too (trinity force too good, tri force into GA too good).
Khazix is very bad at top, mainly due to the fact that you can't really take advantage of his element of surprise.
Rengar is the best, Darius might be able to pub stomp harder and support better though.
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