IM in the movies. More feats, lots faster, more durability. He'd fly circles around her tornados, get powered up by her lightning (if Thor's lightning doesn't hurt him, Storm's sure as **** isn't), then punch her face off.
Comics...Storm's highest showings are somewhat badass, probably even > Tony in terms of total destructive output, but in something like 7/10 I'd have to side with the billionaire, playboy philanthropist.
She has plenty of feats where she manipulates air pressure inside of objects to make them explode, pressed hard enough I can see her simply busting his armor. Her winds have punched straight through mountains with little effort, battered Phoenix tk, easily contained Phoenix Wolverine (lol), and blew around WWH.