By checking out UOAs, I have come to conclude for 5w30, PP is GREAT value for money. They do the job well, and priced really well.
I'd never even considered PP until I joined this site.
Nothing against M1 (ie. their 15w50 looks real good), but I really see no reason to choose M1 5w30 over PP 5w30, especially since PP is cheaper.
I'm all ears though, if anyone has info on how M1 5w30 performs better in any aspect. (The regular formula, not the EP)