Descente by far are my favorites bibs, I also like Vermarc and PI.

The shape of the chamois matters as well. I've found Giordana chamois are not as wide as some of my LGs, and therefore less comfortable to me. I think personal geometry as well as brand is a large factor.

My only pair is a pair of hammer bibs. My ass will hurt past three hours or so, and then I am really suffering for the rest of my ride. I also have a lot of trouble keeping my boys in place while I ride. I'd say if you ride more than 45 miles at a time, spring for a better bib.

I don't have any experience with other brands of bibs, but I think the chamois in mine is larger than it should be yet very weak and soft.