Wow, 2 absolute beasts and p4p ATGs. Unfortunately my answer is the obvious and boring one, in that the size difference determines the result, best for best. McGovern had about 15lbs on Wilde at their respective peaks, which is a huge discrepancy for fighters this small.
A fight between the UK's two greatest ever Flyweights. I have Wilde as the greater Fly, my #1 all time vs Lynch #5 all time, but H2H at their respective peaks, who knows, your guess is as good as mine. Lynch's victory over Kane suggests he shouldn't be discounted entirely.