#1 The Miz

Daniel Bryan and The Miz are no strangers to each other. Bryan started out in NXT with The A-Lister as his mentor. The feud began when Miz attacked Bryan for disrespecting him. Bryan defeated him to win the United States Championship and won his first title in the WWE.
The tension was elevated to a new level when The Miz cut an unscripted promo on Talking Smack. He mocked Bryan for not being able to wrestle in the WWE, and the promo is considered as perhaps the best of the modern era and showed why he's named by many as the best heel in the company.
The rivalry between the two was teased way back in 2016, and with Bryan getting cleared by the WWE, there is no reason why WWE can't rekindle this rivalry. The Miz is the current Intercontinental Champion, and if Bryan gets drafted to Monday Night Raw after WrestleMania 34, a match between them might be on the cards.