Mega Man X wins. Mega Man can take the abilities of machines, which means he can replicate the abilities of Iron Man's armor, Samus's armor, as well as Metal Sonic. Metal Sonic goes down first, and during the commotion, X takes his speed. While Stark is fighting Aran, X takes some pot shots, takes either of their abilities when he can, and then he takes them both out in the end.
It'd be a close fight, though.
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