The Corporation when The Rock was a heel, and they had guys like Ken shamrock, and Kane, and Big Show in the group.
The Hart Foundation because they had so many great wrestlers, and Bret Hart and Brian Pillman were great on the mic, and Owen, Bulldog, and Neidhart were great wrestlers, and were kind of the supporting cast.
I though that Evolution was pretty good right when they were at their best in early 2004, only because of Randy Orton, because he was so great as a heel at the time, and Triple H was great, same with Ric Flair, and Batista was still a bad wrestler, but at least he knew he was and kind of let Randy, Triple H and Flair do their thing, but after SummerSlam, Evolution was the complete opposite of great, but in 2003, and early 2004, Evolution was the best.
early DX, and early NWO also were great, and were some of the Greatest of all time, in terms of factions/groups.