Was having a small discussion with a facebook group member when I commented on a picture of a car putting royal purple as engine oil

I think I recall someone telling me RP isn't the best

I was looking to get a bulk order of brad penn motor oil but after doing a bit of research as to this members claims ive come to a halt

He claims Royal Purple HPS or even rotella t6 is a better option for our motors than the brad penn

Slight research does show higher zinc contents than brad penn

what do you guys have to say about this