That's a bit hard to say. I think there's no definite answer, since it should all fall down as to who you main in the game. For me, I find that Pyrrha and Xiba work for me, it could vary for you as well.
8WAYRUN.com
Fatal_Exodus
Frozen
Hmm... I see. Pyrrha is good , but I always sux with Cass and Soph and I can't cope with Pyrrha -.- I try Z.W.E.I and....^^''' No comment. Now I think about Patsuka and Viola. With others... I need practice.