wimp

When nature calls, it calls. Bib or one piece, they both have to come down. I prefer the bib/Jacket combo for the versatility.

jerseyjoe

2 piece here as well. Make sure you get bibs with side zippers so they fit over your boots.

Slo-bo

If you're going to go one-piece, you better have a short walk to your stand, or be able to carry it, or you're going to sweat big time. I'm for two piece, layered, much easier to adapt to temp. changes.