Hi mate
I am using Avid BB5 on my 1X1 and Avid BB7 on my Pugsley. Really like them both, the 7 has adjustment on both sides while the 5 only has pad adjustment on the outboard side of the rotor. To be honest theres not much in it. They both work great in all weathers and are pretty good on pads. While I may not ride that hard I do give them both a lot of use on some rough and wet muddy terrain and they work consistently. Easy to maintain and as mentioned are easy on pads. Mine run the Avid discs as standard, 160mm.
Would recommend for the sort of stuff I do.
Jamie