I went with the Doctor because he makes ill-ass-beats!
On Em's albums, Dre has a big part in the producing, and I can't say one beat on all Eminems album I don't like.
And when you look at the D12-albums, where Em stands for the producing, along with Mr. Porter. The beats ain't that good as it could've been.
And the Eminem-albums has alot more better beats than the D12-albums!
Though I think the beat in "Leave Dat Boy Alone" is one of the best beats ever.
That's why I went with Dre.