No matter WHO the actual manufacturer is, the OE spec plugs are engineered for the specific vehicle/engine. Off the shelf plugs, even by the same manufacturer under a different brand name prolly won't be spec-ed the same....
Champions are only gud for Chryslers....and lawn mowers...
Autolite makes really gud plugs for racing, or high rpm use...
In the end, it's still best to use OE branded/numbered plugs....gapped properly. No matter what they say, I ain't never seen a full set of plugs gapped correctly right out of the box...