It really is between Beer Money & AMW, both the anchors of their division during their respective peaks, both hugely entertaining. Liek Swinny, I liked a lot of the Christopher Daniels teams too.
Edge would go to AMW based on match quality though. Not that BMI sucked, but AMW have some of the best matches in TNA history to their name.
Interesting that no one is mentioning Team 3D.