We all have our opinions about what's best for our vehicle of choice, but taking age, OCI, climate, severity of usage, cost, etc. out of the question is a bottle of Mobil 1 10W-30 superior to a bottle of PYB 10W-30 looking strictly at whatever metrics are important to a PCMO?
In other words, M1(or whatever syn) is measurably superior to PYB(or whatever dino), but PYB is good enough for many applications.