There's no contest at all. Batman would wipe the floor with five solid snakes at once. You could argue that the very premise of the Batman character is that he's as good a fighter as a mortal man could possibly become! Bruce Wayne spent every waking moment of his life (since a child) honing his skills and physique, probably whilst Snake was smoking behind the bike shed and chatting up girls.
Snake's had more fun in life though - so he has that moral victory!
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