nice picture, fandom set aside. But as far as being a fan: Batman would only win if he knew all about Spidey and Iron Man + he would require the proper planning/time to apply their weaknesses. Otherwise Batman would lose. Nice piece tho.
Batman has some dedicated fans, but seriously, the only way this would happen is after Spidey and Iron Man are too tired to fight back after saving the world. At full strength, they'd murder Batman with ease! Nice picture, but Wayne is clearly dreaming XD