i think all this troll and fv talk is useless.. it depends on how well you farm.. if you get harrassed like hell early game i don't think you can get all those luxurious imba items laa.. just my two cents..

if you want to win 1v1 by pushing the towers, i think krobelus would be a safe bet.. can harrass with her 1st skill as well.. can silent hero.. quite ok what..

broodmother is a good pusher.. but i still think krobelus is better due to the "creep sweeping" skill and silencing.. lol