The title could imply the game takes place in an alternate dimension where all the characters have god-like powers. Maybe an unknown supervillain made them all equals on a whim. Or possibly magic, the strange effects of a comet, alchemy, a computer simulation, a dream sequence...? Just use your imagination, there has to be some scenario where Superman could beat Batman.
Supes and Bats are my favorite heroes. The absurdity of a situation where they would fight to the death is amusing and thought evoking, but ultimately, Batman's the clear winner. Superman has too many weaknesses. Ask yourself this, if you take away Smallville's powers who would win, Clark or Bruce? Obviously the Caped Crusader. So, all the Greatest Detective has to do is nullify the Last Son of Krypton with Kryptonite. Under the gaze of Lead this could easily be accomplished by the Dark Knight and Kal-El would be defeated. Kent's my favorite, but Wayne's got his number.
On a side note:
Wouldn't a Superman and Batman movie be awesome? A serious horror film or a buddy-buddy comedy would be a nice twist.
On another side note:
My nerd factor just increased by 4% with this post.
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