#1. Bray Wyatt

The best run that Bray Wyatt had on RAW was from April 2019 until October of the same year. At that time, he hardly had a few matches, but his impact was undeniable. With that said, one can't forget his 2016-17 run, where he was the most protected superstar on SmackDown.
His storyline and push would lead him to his first World title win and although he lost it at WrestleMania 33 in an underwhelming match and slid down the card on RAW after that, the SmackDown run proved that incredible things can be done with Bray Wyatt. He needed a long time off to come up with a new character and 'The Fiend' began to make waves on RAW, becoming the most captivating character in the company.
He took the Universal Championship to SmackDown, where he's had success ever since. It goes to prove that Wyatt is simply one of those superstars who is better off on SmackDown and he can make his name as the brand's top star similar to the way The Undertaker did for a long time.