Its a weird list (kinda like saying 'whats better: filet mignon, lobster, pizza hut meat-lovers, or a nathan's with michigan sauce? '), but I know both Dre albums and Doggystyle like the back of my hand, and I'm unfortunately very familiar with both Em productions.
1) Chronic 2001: Not as revolutionary as Chronic, but that's like saying Godfather II is not as groundbreaking as The Godfather. Godfather II is the better movie.
2) Doggystyle: All the lessons learned from the Chronic Dre poured into Doggystyle and it shows. Similar albums, but this one is just a little more evolved.
3) Chronic: Groundbreaking album in rap. The first rap album that said 'screw that underground garbage, we're takin this on our terms'.
4) Encore: Eminem's 3rd best album, and I still haven't listened to track 1 from Rehab.
5) 8-Mile Soundtrack: Lose Yourself is an amazing song. I don't care what you say. But, the second best song is 'Wanksta', which while funny to call your friends, is not all that great a song. If they would've put in the battle at the end, this might pop up above encore though (This guy's real name is Clarence, Now clarence lives with both parents, and Clarence's parents have a real good marriage)