User blog comment:So-Pro Warrior/3 Way Battle: N.E.S.T. vs. U.N.I.T. vs. S.H.I.E.L.D. (MCU)/@comment-3189283-20120704200745/@comment-3189283-20120704203801

The differeance being QK is that while the other two are capable of taking on foes alone UNIT always need help and always fail when alone.