Iron Man VS Batman

It's the age old debate, the billionaire's battle, the Caped Crusader against the REAL Man of Steal. It's always been abundantly obvious to me that Iron Man would win this match in a heartbeat, but it has come to my attention that there is a large amount of people that don't agree (none of which that have given any legitimate reasons). I always figured that a man completely covered in steel, armed with missiles, lasers and his signature energy blasts could easily take down a man in tights and a bulletproof vest throwing bat shaped ninja stars. None the less, I'd like to hear what you guys have to say on the matter!