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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Iron Man would beat Batman down at the first fight and then Batman will do some push ups and then he'll go from the desert to LA in 5 hours and kick Tony 's ass.