Normally I'd say that Batman would win, since the only reliable rule in the DC universe is that [b]Batman [u]always[/u] wins.[/b] But since Iron Man is from Marvel, if have to go with him. Wits and firepower vs wits and batarangs? Get real fanboys.
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Batman is way wittier and takes on multiple opponents that dwarf Stark. Batman would probably just attack when he isn't in the suit anyways...
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...which would completely negate the point of this argument.