It's more expensive, but a full synthetic race oil is better simply because it has a higher ppm of zinc, which is part of the additive package. The feds have decreed a reduction from 1300ppm to around 500ppm for motor oil. The racing stuff still has 1300 or so ppm. So does some of the motorcycle synthetics.
Check out Joe Gibbs racing oil for the particulars.
Bert
BSMRA