I only used PFCs on my M3 and I can't say much except I never found a reason to switch.
I've used PFC11, PFC08, and Pagid Yellow(f)/Black(r) on my 964. They all worked well, but I prefer the 08. Just feels smoother, seemed to bite better, and seemed to work better in more ranges. My pagids also squeal when they get hot, which is annoying.
