Theoretically, Brainiac 5 and others in DC team would curbstomp...... However, geniuses in marvel team have better feats (Shellhead or Dr Doom can casually make a time machine, which is a highly tough job even in 30th century, another proof is that Steel armor was considered bleeding edge tech even in 117th century, still it is barely at the level of Iron Man armor of 1990s). Keeping these points in mind, it is pretty obvious that Marvel team curbstomps.
" He won't win, but as seen by their fight, and the fact that he one-shotted an upgraded Ulik three times in the same number of issues, Iron Man will do well before losing to the Thunder God. No shame in it, anyway. "
That Ulik was giving Thor one hell of a fight...... I think that Iron Man was a bit overrated.