wow, i'm really the minority here.
while i appreciate bruce wayne's ambitions in batman, essentially, he's a rich bitch with a utility belt and a butler.
superman cannot be seperated from him numerous and extremely useful powers. the only way to kill superman/clark kent is with kryptonite, while batman/bruce wayne could be brought down by a bad cold, or any other plight of man.
edit: i would do batman over superman. i think his extreme and awesome superpowers might throw off his game. and i could make batman my bitch.