:34:NWO, hands down.
I would pick Evolution over Horsemen.
The nWo. Evolution. DX. And any faction that ran roughshod through a promotion ALL took something from the Horsemen. Backstage beatings? Horsemen. Getting face heat as heels? Horsemen. Taking over an entire broadcast? Yep, Horsemen. Center of focus and top draw for an entire promotion for 5+ years? No one but the Horsemen. The most often imitated faction but never, ever duplicated. The closest thing was the nwo and people were more than sick of them after 2 years. People were clamoring for the Horsemen for so so long after WCW that the E had to essentially rip off the idea in the form of Evolution.The nWo in a sense spawned D-Generation X and numerous other "World Orders" what did the Horsemen spawn? The Impact Players and Radicals maybe?
Are you serious about the Impact Players and Radicals? Neither is close. The Radicalz were 4 castaways from WCW and were booked as such. The closest thing ECW wanted to book like the Horsemen was the TripleThreat. The Impact Players was a friggin tag team. Your wayyyy off base.
I think alot of fans were only exposed to Eric Bischoff's dicking of the Horsemen. Know why Bischoff let the Horsemen exist under the nWo? Because they still drew shitloads of money and sold shitloads of merchandise in the watered down form that Bischoff presented in the WCW turf of Georgia to the Carolinas. Go Youtube Ric Flair's return in 98 to see how much they meant to the longtime fans. You don't see people signaling nWo when Nash shows up in TNA or anywhere Hogan goes. You still see 4s thrown up everywhere Flair whores himself out to.