This is a dumb ass question considering first week alone alot of the IMax midnight showings of Dark Knight Rises are already sold out and it's already one of (if not, THE) most anticipated movie this Summer.
I've been kind of surprised how little hype Spider-Man is getting. I'm sure Spider-Man will do fine but it's not going to do DKR numbers at all.
I'm not even sure what to think about the Spider-Man film. The newer trailer sort of interested me a little more than I had been but I'm still pretty lukewarm to it. Shame since Spider-Man is still easily one of my favorite characters and pretty much the book that got me into comics. Not sure that Batman is going to live up to expectations either, but at least aside from the ing stupid football field collapsing, the trailer looks interesting.
i think spideman would do better. first off i hate imax and its whole money grubbing existence that said the new spidey film is being shot from a different perspective which i think would lend itself very well to imax more so than batman. alot of people will see both but many of those who saw batman will later go see spiderman once they hear how awesome it looked in imax.