Well, I don't think (and this is ONLY MY OPINION) that UOAs tell us exactly what we think they do, so I don't chose an oil based on that alone. I might if I had known about and used Terry Dyson's service before joining this board.
Either way, I think RedLine is superior oil. I can't claim it's necessary or cost-effective in lots of applications, but I like it best on its own.
Several years ago I was talking to Royal Purple's tech folks for a couple of days about various things, and they told me at that time that their street oils at least were NOT synthetic. IIRC they may have been a blend, but I don't remember for sure any more. It seems that, at least then, it was their additive package that was doing the lifting for them (not unlike many Schaeffer oils now). That doesn't make it a bad/worse choice, but if that is still true, it may explain the tendency for their street oils to shear down.
I think you'll have good luck with either.