I think i might add a character to decepticons so it's a little more equal.
If I can only go with one I'll go with these 2.
Alt mode; off road truck
Bio; the more volatile of the two; she's willing to use anything to get her way in things. Doesn't matter what side you're on she'll kill anyone that gets in their way. Both of them ussually go off on their own with their own plots not involving others.
Alt mode; sports car
Bio; of he and his sister he's the planner and the more sensible one. With others he speaks for both of them since wildstrike isn't the easiest to talk to or cooperate with.