Being slightly circumferentially enhanced (5-10, 210), the big benefit of bibs for me is they completely, and I mean completely, eliminate the whole waistband rollover issue I have with nearly all shorts I wear. That's enough of an advantage that bibs are just about all I buy. I can't speak for "normal" folks.
Oh, and Dudelsack is right - they offer no back support whatsoever.
Last edited by CraigB; 03-04-12 at 10:21 AM.