Hmm...an interesting match indeed. Megas has the size advantage, but that's never been a problem for Eva before. The context-sensitive Big Red Button is major hax, but...the rules of MPFC say that all characters are in their most powerful incarnation, and all indications from Akamatsu are that we still haven't seen Eva's full power--and given the nature of that curse on her, I somehow doubt we ever will. Given what we already have seen her defeat effortlessly, Evangeline is the obvious pick.
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(This space for rent...okay, not really)
[NO BARKLEY NO PEACE]