Not a hard decision at all...

You have no value in 3 betting esp with 2 callers to his open and these games are played sooooooo deep and its soooo early... 3 betting puts you in a terrible spot post flop.

Its a simple flat on button see a flop then depends on what happens post flop what your next move is.

If you have any information on the two guys who called his open might even make it a simple fold, but I would flat and see a cheap flop and take advantage of post flop play.