#1 The Undisputed Era

Was there any doubt about this one? The New Day might be the most experienced group in WWE today but The Undisputed Era is arguably the best faction in all of WWE right now.
Ever since the group's formation in 2017, there haven't been many moments where The Undisputed Era has not had momentum on their side.
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Led by reigning NXT Champion, Adam Cole, The Undisputed Era has dominated NXT for the past three years and has taken out anyone who dared to step in their path, running roughshod through the entire roster, and even taking out some of our favorite superstars in Tommaso Ciampa, Keith Lee, and Johnny Gargano.
When it comes to factional wars, The Era boys even made their presence felt on UK soil by attacking Imperium at NXT TakeOver: Blackpool II and making a big statement. Well, if that wasn't enough, the group even completed their desired prophecy on the first live episode of NXT on USA Network when Roderick Strong won the NXT North American Championship.
The win meant that The Undisputed Era held all four available men's championship in NXT, with Cole as NXT Champion, Strong as North American Champion, and Bobby Fish & Kyle O'Reilly as NXT Tag Team Champions.
When it comes to factional wars, The Undisputed Era has all the confidence in the world in their numbers and believes the mantra of ganging up on superstars that they wish to take out. With The New Day consisting of three members, it is a well known fact that Cole and his men would have no problem using the numbers game to their advantage, even if the two groups face-off in a 6-man tag team match.
As a matter of fact, a few months ago, The New Day had to team up with Heavy Machinery when The Undisputed Era made a few appearances on SmackDown However, the next time the two groups decide to clash, there is no need for a third party to involved and we could finally see a proper rivalry between The New Day and The Undisputed Era.
A match between the two top factions is something WWE fans have been wanting to witness for a while now and even NXT Champion, Adam Cole remains open to the dream clash between his group and The New Day. Let's hope this could turn to a possibility someday!