Goodmark and Sherman Share stampers and still make parts, Goodmark in some areas is only supplied by Keystone, Which is who bought goodmark a while back, AMD is AMD, but speculation is they still share stampings. With a skin IMO it comes down to your money, Its easier to put a Full quarter on but if you cant get past the price difference vs the labor of the skin. then you go with the skin. Either way more labor or more part for the dollar. AMD has a sharper body line then the other 2 and popularity will say AMD. I can sell you either one