Cxserver,
I agree with the others. Use up the GTX(a good oil itself) and buy the PYB on sale when possible. But, don't overlook any of the other name brand oils when they're on sale too! Compare oils in your particular vehicle to see what "you" like from a "seat of the pants' feel/sound.
I have used so many brands of oil that I almost can't tell you what I liked best. I guess this says something, doesn't it? I do like oils that help to keep the engine(s) quieter and I often relate this quietness to "quality"!
Castrol always seemed to keep my engines a bit quieter than most other oils and I never noticed anything special about the PYB from a "seat of the pants" feel/sound but, I used it aplenty!
I buy oils on sale w/rebate, discontinued or closeout etc. Discontinued/closeout doesn't always mean the oil is out of date or the spec is changing(although it sometimes does), sometimes it means that a particular store that I frequent is making room for something else and has it on sale to move it more quickly. A really good sale
I am quite fond of the PEAK oil w/filter(FAR) that I had used recently. 30 qts and 6 filters. I used it mostly in my daughters car and did notice the quietness/smoothness of the PEAK compared to many other oils. And the PEAK did fine on 5K mile OCI's. Seems as though it could have gone further. The PEAK has a good "seat of the pants" feel/sound about it.
Right now, I have a boat load of both HavDS and QSGB and I'll be mixing in 2 qts of PP or QSTP with 3 qts of either of those dino's.
One thing that I have notices over the years since discovering BITOG. Just from a "seat of the pant" standpoint...I don't really like synthetics. They make all of my engines more audible and I feel more vibrations. But, one can't argue their success!