I think Sven stands a better shot of killing people with blink dagger, as he brings his own stun, the others do not. Sven with crits and ult up can unload 3000 damage before storm bolt wears off without needing help from allies. You can run from troll and naix and ursa, provided they don't instant-bash like they always do against me. While all 3 of them have slows, slows are not stuns and won't stop force staffs, ghost scepters, CCs, etc. Sven doesn't need BKB to gank Lion, the other three do (luckily naix gets his for free, but his damage is nowhere near the rest either).
http://www.dotabuff.com/matches/1335776740
6 slots Troll vs me with only 4 slots on PL, and really the only reason we lost was because we had no way to content Rosh so they got it 4 or 5 times uncontested and managed to break base with aegis, and they had a couple of team fights they should've lost but got clutch black holes to turn it around. Troll really did very little work and wasn't a threat at any point in the game, he's just the one who gets the kill while his team is doing the actual work keeping people CCed. But, any carry could do the same thing, what does Troll have that anyone else does not?
Also, if you really want to fuck with Troll pickers, just pick Bloodseeker and spam rupture on them. The only thing I actually like about this hero is his ability to beat most heroes in lane phase.