Hunter is just better for everything, you can play priest/hunter/pala, priest/hunter/rogue, priest/hunter/feral and they are all strong comps.
Warrior is really mediocre now.
In 2s you could probably get away with either decently well, but Hunter is strong in 2s for sure because they can trap into Fear for more CC.
In 3s Hunter/Disc/Rogue is your best bet by far. Although I honestly think Fury Warrior/Rogue/Disc could be decent, Fury does a crazy amount of single target damage nowadays.