I always liked the Stuntacons best. At least cartoon and toy wise. Hell, if anything showed why Rodimus Prime sucked big time it was the episode where the Stuntacons (All of which have different severe mental illnesses) outsmarted him and tricked him into giving them the Matrix.
Plus the one time they had the big Decepticon gesalt vs. gesalt battle, It was Menasor who was the last big bot standing.