3) AJ Styles
AJ Styles has been incredible both as a face and a heel. He has been a fighting WWE champion in both the personalities with the fans firmly behind him during both. However, whenever we compare both of his reigns, we might very well find out that his heel work was better.
AJ Styles' cocky and ruthless attitude as a heel were key parts of his title reign. He worked brilliantly and defeated biggest babyfaces like John Cena, Dean Ambrose, and Dolph Ziggler. His in-ring work and character work at that time was the best character in the WWE.
Compared his 150-day reign as a heel to his 300+ day reign as a face, many people would choose his heel-reign as he was much better as a heel than a face. Many fans even want heel AJ back and that would be a treat to watch.