#3 Best Friends
The Best Friends have been together for quite some time, but they've not had a sustained run in any company for a while, so to see them together in AEW and to pick up the win at Double or Nothing was huge. Chuckie T and Trent Barreta are masters of comedy wrestling, but their match against Angelico and Jack Evans proved they can really go in the ring, making them one of the more diverse and entertaining teams on the roster.
It's going to be fun to see which side of Best Friends we get to see in the early day's of AEW because there's certainly a story arc to be told with both sides of their game, but they looked just incredible at Double or Nothing. The Super Smash Bros debuted following their match, so they seem to have a ready-made rivalry for the near future, but if AEW can get that balance right, they'd be a great team to carry the titles right off the bat.