WHY WOULD YOU EVEN DO THIS.
I like Tony Stark more as a person, because his mentality and personality are a lot more stable than Bruce Wayne's. Tony has his issues too, but he handles them much better than Bruce does. He's easily likeable.
But in terms of being a hero, I'd have to say Batman does it better. I just feel like he understands the concept more; how to go about doing things, knowing what the appropriate time and action should be. He's professional, although Iron Man can be sometimes too.