I actually just tried an experiment with Universal Clays and Power Pistol in 165 grain bullets. Guns used were a HK USP Compact (4.5 Barrel), Glock 24C (6 in comp barrel), and Beretta 96fs (5 in barrel).
Both loads are rather accurate, and the Power Pistol seemed to be a bit better (but that may be New Load Bias there).
The Power Pistol is a bit hotter by nature, so recoil was a touch sharper and muzzle flash was a bit brighter. Overall, to me at least, these two powders are pretty close. I haven't chrono'ed them yet, but I would imagine the Power Pistol will be faster. Plus, the loads were book starter loads, so they aren't very tailored yet. That's when I start chrono'ing and getting serious about the accuracy.
Also, I compared PP to Blue Dot in some .357 mag loads. Blue Dot brighter flash, PP much sharper recoil. (This was 125 grain out of a 2.25 SP101.)
I use Blue Dot in 180 grain 40 loads, but haven't shot 180s in forever since my Beretta (and my friend's HK and Glock) like the 165s.