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.
Yeah, really, if she goes all out and is summoning solar tides and hurricane-force winds and sh*t, she's got a real chance. Tony wins a majority, but "Storm 0/10" shows a lack of knowledge about the character.
Movies, well, yeah, nobody's really taken her side, rightly so.
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.