Both have the ultimate superpower: money.
Iron Man's advantages:
Flight
More durable
Loved by the ladies
Lasers
Jarvis
Batman's advantages:
He's Batman
He has a kick ass car
He's Batman
Better in hand to hand combat
He's Batman
Who wins?
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Pretty sure Batman would win. Even without prep time, Batman carries around EMP gadgets and the like. Of course, I know jack shit about Iron Man (not really that cool, pre-Robert Downey Jr. movies).