#1 AJ Styles

AJ Styles is one of the best athletes to have ever stepped inside a WWE ring. He had an amazing 2018, and, remained the WWE Champion for more than a year. Styles has faced John Cena in the past, and, those matches were certainly classified as dream matches. If anyone deserves the most to retire John Cena, it is AJ Styles for sure.
Styles vs Cena would be an excellent rivalry. Styles is definitely as good a wrestler as Cena is, if not better than him. Styles defeating John Cena and retiring him would be a very good story-line. If he retires Cena, he won't receive much flak, as, he is a fan-favorite superstar.
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This match can headline WrestleMania and, people from age eight to eighty would look forward to it. The creative team along with the WWE management, should book this match. It would be 'good for business' as well.