1. Iron Man's name is spelled right. I don't think "Batman" is in the dictionary.
2. Batman has a loyal flesh and blood butler.... Iron Man has an AI butler he made himself, whose name is JARVIS (Just A Rather Very Intelligent System)
3. Iron Man named his robots Dummy, You, and Butterfingers. Batman doesn't have a robot.
4. Iron Man's team, the Avengers, consists of a bunch of humans and one god, thus showing that humans can become their own heroes. Batman's team, the Justice League, has aliens, showing humanity needs support even from the other planets.
5. Iron Man's real name, Tony Stark, just sounds better than Batman's real name, Bru