It really depends on what kind of bencher you are. That is, if you tend to emphasize your triceps or lats more, or if you're a technical bencher or can just power through. Raw illegal wides can wreak havoc on your sholders, though, but I don't know many BBers who do this often.
I would strongly suggest varying your grip to work all areas of the lift. Use a wide grip one chest day, a medium grip on a different chest day, and a narrow grip on a third chest day. Or, as I often do, use different grips during every bench day. For a dynamic bench day, I will hit 3-4 sets each with a wide, medium and narrow grip.
I've heard that wider grip stance often equals more weight pushed, but in my experience, I've found a medium or relatively narrow grip to be favorable to my individual groove and thus allow me to put up more weight.
Remember there is no "best" grip -- do whatever works best for you! And don't be afraid to change things up: change your grip, posture (benching with leg drive versus legs on bench al
a floor press style), supinated versus pronated versus mixed in all pulling movements, partial movements isolating the top or bottom end of the lift, et cetera.