If you include solo Wu albums which are really Full Wu albums with a member just more prominently featured, they got the best catalogue. I prefer A Tribe Called Quest to Outkast but you have to say Outkast has repped Hip Hop well with great music and an ability to grow. Big Boi has improved mightily, 3000 already a GOAT contender.
So to me, objectively they are probably the GOAT, but personally they outside my top 5.