Tux Question

We went to pick out the tuxes for the guys yesterday at Men's Warehouse. We are still debating whether a two or three button jacket will look best. Is the only difference between the two that more of the the vest shows with a two button? What did you girls go with? Is one more common than the other?

TIA

MOST of it is how much vest shows but can also influence the cut. . if you have shorter or stockier men. two button is really the way to go. . three buttons can make some guys with shorter torsos look 'not so good' okay I can't seem to phrase correctly but..