Logic dictates that Batman will lose because, even with prep time, Superman is smarter. Comic book fans, however, tend to have a force stronger than logic called shouting.
Yeah but maybe Batman will use Kryptonite! Awesome poster. I love how minimalistic it is.
And Superman will wear a Lead Suit.
He probably won't even realize he can use lead until after their initial confrontation in the film. Honestly, I don't even think they'll address it at all.
I'm just thinking in terms of an actual Superman/Batman fight.