In my observation, PP cleans better than M1. I ran M1 in our Pontiac since 1500 miles, and switched to PP a year ago at 72k miles. Looking into the filler, everything always looked very clean. But the first drain of PP was much darker than usual, subsequent drains not so dark. What I can see through the filler is even cleaner than before the switch- it honestly looks new at 85k miles.
OCIs based on the Oil Life Monitor averaging 7k miles with AC PF47 filters.