Superman. If I remember correctly Deadpool can die, he just doesn't get sent to hell or whatever.
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He can't, actually. Thanos made him complete incapable of dying. The closest he can get is a brief moment with Death before he wakes up again (which he hates). Not that this means he'd beat Superman, though.
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So he can be captured and held prisoner in the mean time?
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Uh, I guess. It's usually only for a second or so, but if somebody can capture him [i]very quickly[/i]...
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Then superman wins
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Deadpool has a super regenerative ability he got from Wolverines Dna :| I have yet to see him die