I have used both in several different loads in multiple calibers and I like them both. The flash of PP is impressive AND distracting. That flash is less obvious in 9mm that the others and PP made some nice accurate 124/125gr loads for me just barely sub-sonic at 4.5gr PP out of several guns. Works well.

BE86 has the middle ground covered pretty well and has kind of taken Unique out of the picture for the last few years. BE86 also worked better with coated bullets in 40, 45 & 44mag. BE86 did not work well for me on the slower loads and started to get dirty in 45 when speeds dropped. Bullseye still seems more versatile in 45 for diverse use and offers noticeably less recoil.

IMO, neither PP or BE86 is going to replace 2400 (or Blue Dot) for true full powered mag loads. I was happy with some loads out of my 629 with 240LSWC in mag case under 7.7gr for general use up to 11.4gr for faster stuff. I still prefer 2400 for the grin inducing stuff though.