#2 The emphasis on full-time tag teams
The Usos have enjoyed a nearly decade long tenure on the WWE main roster, which has included winning tag team championships multiple times and often being featured as one of, if not the single top team in the company. That includes these past two years on SmackDown when, between The Usos, New Day, The Bar, and The Bludgeon Brothers, the tag division has been deep and of consistently high quality.
However, a team like Shane McMahon and The Miz winning the tag titles at the Royal Rumble underscores how WWE tends to look at tag teams. They may get a decent chunk of TV time and get to put on good matches, but at the end of the day, WWE tends to feature singles stars and think nothing of pushing a makeshift team of two stars over full-time teams to serve storylines.
With The Young Bucks, Lucha Brothers, and Best Friends already in the mix for AEW, besides rumors that Anderson and Gallows may jump when they’re able, and with The Revival possibly interested, too, it makes a fair bit of sense that The Usos would see more potential to thrive in AEW than in WWE at this point.