Well if Doom only used Technology and didn't include Magic (or his power to switch with the winner anyway). Excluding if Stark let him live with enough strength (more likely he will cause he's a hero and what not, not saying he won't, but he's likely too), Doom would use his time platform to go back in time and change the outcome to his favor, because he knows how it gonna happen. Excluding ALL THAT, Iron Man is slightly better tech. wise, because its all Stark has, so its bound to be a little more thought out.
But good thing Doom thinks about these things, and has magic, and a time platform and the ability to switch minds.