I ride a mtb for commuting (40-90 min, daily) and for training on gravel roads, (60-90 min, maybe weekly) and a road bike for longer rides on paved roads (2-5 hrs, maybe weekly). I prefer bibs on longer rides when I have to eat on bike as my stomach tends to cramp a bit otherwise but for rides up to 2 hrs I'm fine with shorts, road or mtb.
I wear:
- an old pair of Nike spinning (?) shorts with sloppy thin chamois. Fine for short commutes, useless for longer rides.
- a pair of PI Ultrasensor shorts, 2-3 yrs old?. Thick padding which is soft but getting annoyingly sloppy and can chafe on longer rides.
- a pair of Gore shorts, newish. Firm padding, look nice but a couple of shoddy seams started to unravel almost immediately. Leg grippers are a bit tight in the long run.
- a pair of PI Microsensor bibs, newish. Firm, thinnish padding, nicely made but the shoulder straps feel a bit skimpy and too stretchy
- my club bibs, made by Craft. Mens model, a tad large, comfort ok, but not my favourite and I tend not to use it outside club rides cos the design is hideous 
Still looking for my absolute favourite, I suspect it's expeeeeensiiive... and will have to wait until one of the above expires for good.
Winter riding is much less about badassery and much more about bundle-uppery. - malkin
1995 Kona Cinder Cone commuterFrankenbike/Selle Italia SLR Lady Gel Flow
2008 white Nakamura Summit Custom mtb/Terry Falcon X
2000 Schwinn Fastback Comp road bike/Specialized Jett