Which plugs are best for performance?

I prefer Champions because that what got screwed into the heads at the factory.
Autolites are just too Ford-y.
I like Allis Chalmers, (AC), but I'm not buying plugs for a tractor or a GM car..
And I'm not Japanese, so that leaves Champion.
I used to go to a couple fine junkyards out in the corn, and along the way, in a farmer's field, at a fence line, was an old 1940s Champion spark plug sign, about 2'x 3', and as I would go by it, I always went deep into the throttle to hit passing gear and let my Champions say hi to the sign.....