Team 1, somethin' fierce...
EDIT: Realized I should clarify -- Beast Boy is the weak link in this regard (not that he is a slouch), and can be taken down fairly quickly by Achilles (via strength/skill), Ares (weoponry/skill), or Hercules (punch/mace); after that, it's 3 on 2, and while Gamora is tough and highly skilled, and Skaar is powerful, they won't stand long against that trio ("long", of course, being a relative thing...)