Iron Man for sure. Iron Man has the armor that is durable, the technology, the knowledge, and the weapons!

no iron man is stronger because the punisher only has guns but iron man has armor and iron man has more bombs and guns in his whole body. and gun shoots can't go througe armor

an armor called The Hulkbusters

No!

-He in fact does have several suits you may or may not be referring to. He has the Arctic Armor which is an off blue and silver which he wore in Iron Man 318, the Iron Man fantastic four armor which is more of a blue and black, the Iron Man stealth armor which appears in Iron Man #152, or the Patriot Armor which I think makes it's first appearance in the Dark Avengers story line but I may be mistaken.

Iron Man would beat him up but it won't work. Batman would hack his tech armor in 1 second. Iron Man will try to kill Batman but he can't. Batman will hack his armor, Iron Man will try to fly but he won't. His armor will be destroyed in 1 second. His armor will explode into pieces and Batman will knock him out with one punch in the face.