Who would be the richer of the two. Bruce Wayne (Batman) of Wayne Enterprises from the Nolan movies or Tony Stark (Iron Man) of Stark Industries from the Favreau movies.
I think Tony stark because he has a lot of money to buy nuclear technology and he might be richer than Bruce Wayne.
Although Bruce Wayne does own a multi-billion dollar industry Stark has one similar but it due to the fact Bruce Wayne inherited most of his money and owns about half of Gotham so I'm going to say Bruce in that instance.
He's so rich he makes a high tech layer in a cave.
He's so rich he has a car with infinite gadgets.
Wayne also bought many other countries in other comics.
So i'm going to have to say Bruce Wayne the Batman and he's definitely more realistic than Iron man.
I would have to say Tony Stark. Batman may have a lot of money, but Tony has his own personal AI, a vast amount of metal to build his armors. A wonderful home with lots of neato gadgets in it. Bruce doesn't really compare when he has a leather bat suit and some extra fine gadgets and a cave he found.