#3 They won more titles
One of the key metrics of measuring the success of a stable is the number of titles its members have accumulated during their tenure with said stable. Here, the nWo far outweighs DX. Not only has the nWo won 30 major titles during its time to DX's 22, just look at the importance of the titles won.
8 World Championships to 5 WWF Championships, 9 United States Championships to 2 Intercontinental Championships, and finally, 10 Tag Team Championships to 7 Tag Team Championships.
Will John Cena beat Ric Flair's record? A former WCW Champion thinks so HERE
Other titles include 3 WCW Television Championships and 1 Cruiserweight Championship to 2 European Championships, 5 Hardcore Championships, and 1 Women's Championship held by Stephanie McMahon, of all people.
The numbers don't lie. nWo was by far the more successful faction during its era of dominance.