I doubt that anyone knows the answer to that question since it would take a bunch of money and even more time to figure out.

Guys like Dwayne Porter see a lot of heads from different shops so he could probably tell you which heads to buy and which to avoid.

I also think there is a lot of specialization between the shops. Chapman was the place for the Stage VI heads but who knows how good their Indy program was. Maybe Best Machine has the best program for B1 heads but they might not have the best W8 or 5.7 program.

Bottom line is that nobody has enough money in this business to be the best at every single flavor of Mopar head.