Originally posted by Herr Logan
This is the real answer: Batman, as a fictional character, would probably win. That's how the comics work. It's because Batman has a higher drama factor. He's a better icon. Spider-Man has more reading value in the long run (or it did back in the Silver Age), but Batman is a classic, immortal symbol of You-Don't-Want-A-Piece-O'-This. When two icons of similar stature such as Superman and Batman fight, Batman will win because it's the more surprising outcome (on the surface, to non-Bat-experts, anyway) and because Batman is a better character. Read enough comics, you'll see how it is with these things.
That said, I have to declare that this question is incomplete. You can't begin to answer this without context. Where are they, what can be used in battle, are both combatants at their peak, are they fully equipped? Most importantly, does Batman know who he is going to fight ahead of time? If both are at their peak, then Spider-Man should win on the basis of his metahuman speed, strength and spider-sense. If Batman was prepared ahead of time, he would bring some kind of gadget that would circumvent Spider-Man's spidey-sense, leave him physically vulnerable, and then he would take him down gently with a light ass-whooping. Batman is known as a more mature, always-prepared, obsessively meticulous character. If he met Spider-Man even once, he'd have a rough idea of how to deal with him should they ever fight. Only if Batman didn't know the extent of Spider-Man's powers would he not be ready. Keep in mind, if there is any public note of Spider-Man's spider-sense at all (he has let it slip out in front of people), even if not in an obvious medium, then Batman would find the information, memorize it, and make a plan to counter it.
I agree,but I also disagree.If Batman met Spider-Man,there's no doubt that he'd gather ways of defeating him,but so will Spider-Man to Batman.It has been mentioned in Amazing #54.The both of these fighters are strategist,Batman being the most dedicated of the pair.But,don't assume that just because Batman is a better preparer that Spider-Man would just fall to his knees.He's been known to take people like Doom and Iron Man in the stretegic area when he wanted to.It might not have been as high tech as something Batman would come up with,but it got the job done.