#3 Match quality
Although Joe has considerably slowed down over the years, he can still put on a clinic whenever he wants. Just watch his matches with Nakamura in NXT for the championship. And when he comes up against Big Match John, the match is a guaranteed classic.
Cena's incredible matches with Styles prove that age is just a number for him. Cena wrestles a very 'WWE style' while Joe has a completely different moveset. It would be a treat to watch these two veterans slug it out in a battle of resilience and strength.