#3 - AJ Styles
Since neither Daniel Bryan nor AJ Styles are well poised for a heel turn, this rivalry would most likely have to take the form of a face versus face feud in which both competitors are respectful of one another's athletic prowess.
This dynamic needn't harm the overall quality of the feud, though. For proof of that, you only have to look at the brilliant match AJ shared with fellow good guy Finn Balor at Tables, Ladders & Chairs last year.
WWE often prioritises big names over great matches, but this one has both. We're talking about two of the most popular stars in the company, and two of the best in-ring workers. Booked correctly, it would be a massive box office draw for casual fans and the die-hard internet types.