I've personally used a lot of both... my opinion is a lot of goodmark parts are better than people here claim while a lot of amd is not as good as claimed. Certainly neither are as good oem metal. AMD does retool parts and improving parts, not sure others do that. I've used some really poor fitting amd parts, so overall I don't have as high as an opinion as others do.

On inner fenders for a nice driver, I'd use the lower cost option.