Even though this is an apples/oranges comparo, the question still stands. As such, i would go with Maxlife for the reasons Zeadock listed. We know Maxlife is part syn, we assume PYB has GTL. Also, as has been mentioned in other threads and can be found on Valvoline's website, Maxlife is perfectly fine for newer vehiles. I know, that last sentance is debatable to some. But, either one is a great product and you can't go wrong.