At 51 you can't harm all the midlevel guys. Sometimes, because you have heroes in range, this means you have *more* targets. Often though it can mean you have *less* targets.

To me that's the rationale for wanting to stay at 41 for controls - greater accessibility of enemies and the enemies you have having less survivability. The mechanics differences are not as important to me, you need to fish where the fishing is good.

Of course, none of that applies if you're not that guy charging ranking groups trying to pick people off.