Back to the OP, what's getting left out here is that Tony Stark designs and builds his equipment from scratch, the original built with hand tools in a cave. In the early years it was also a theme that the pods on his hips carried toolkits so he could build unique weapons and devices in the field.
Bruce Wayne is certainly a genius in his own way, but a genius detective and profiler. He is not an inventor in anywhere near Tony Stark's league, he is dependent on Wayne Industries technology and his R&D development. Bruce's tech savy and certainly has equipement made to his custom specs but in terms of preparing it would be like this: Tony Stark would win the first round; Bruce would come up with something clever to win the second; Tony Stark would win the third after redesigning and upgrading his armour and preparing for Batman's tricks.
I remember one Marvel vs DC where Bruce jabbed a nerve center in the Hulk's solar plexus causing him to inhale some knockout gas. Yeah, right. If want to pick and choose, the writers have come up with just about everything over the years. I think an interesting match would be the Nolan movie Bruce Wayne vs the Iron Man movie Tony Stark. I think it would play out pretty close to what I wrote above: Tony wins, Bruce wins, Tony wins. Fourth round is up in the air.
Ultimately Bruce's greatest power should be figuring out what his target is after and getting one step ahead. If the target is Tony, and Tony wants justice, the battle would end right there.