Its not realy a matter of who you stand by but why. In the comucs it was over power registration and keeping the identities of heroes safe. This was because villuans would go after the heroes loved ones. This is actual spoilers if you havent read the comics... [spoiler]peter parker reveals he is spider man when he sides with tony stark on power registration, then king pun hires hit men to kill peter but instead they kill aunt may. Because of this peter litteraly makes a deal with the devil and breaks off his marriage with MJ resulting in his aunt not being shot but for the two of them to have never fallen in love but also resulting in the death of their un-born daughter. He later goes on to hate iron man and go on a rampage killing everyone involved with aunt mays death and even going after iron man for not protecting her when he told iron man he had people he loved and didnt want them to get hurt.[/spoiler]