It's going to boil down to the fact that Bruce rarely uses or builds powered armor while it's Tony's bread and butter. Sure Bats is a better martial artists, but he'll be in a suit that limits his mobility and is no where near as 'comfortable' as his usual combat garb. Even then, Tony's not going to just walk into hand to hand, he tends to fight as a blaster where bruce is going to be at a further disadvantage.
Batman's one saving grace is that he's a better tactician but by donning the armor he's putting himself at a extreme disadvantage. Tony's armor will be more advanced, more streamlined, and more capable if for no other reason he's had the history behind it. He''s not going to be walking out in a suit that's likely never been through a shakedown, he'll be in a proven design that's had its weakness shored up and compensated for.
Where's the Hulkbuster?!
It would kick that robots butt.
but knowing that batman can not kill( moral reasions) but tony might if he felt threatened enough (but thats human nature)
but it would be a good fight to see none the less, who knows tony might actualy win with jarvis hacking batmans suit, ya never know
i like it anyway, but i love tony and batman ^.=.^