People listing Pharrell and not The Neptunes when talking production will never sit right with me. Automatically not taking the opinion seriously at that point.
Listing Andre 3000 and no Mr. DJ or Organized Noize for GA is bogus.
Gillie is from Philly and he couldn't even list Scott Storch.
Scott Storch not really from Philly either. He from NY or someplace. He barely lived in Philly, but only got his first placement with The Roots.
But at the level they're talking about, as far as hip-hop based producers, there's only a handful. Neptunes, Timbaland, Puff (yes, we know it's not really Puff), Teddy Riley, JD, Dre, Swizz & Kanye. You can prob name 1 or 2 more, but that's it. Whether or not those are the best is another discussion.