Yeah. The Whitebeard Commanders are quite strong. It's more of a hunch but I'd side with Aokiji slightly. Jozu seems stronger and faster but Aokiji has serious stamina and actual ranged/elemental attacks while Jozu only has his physical prowess. As we saw it only took one mistake for Jozu to lose. Aokiji being a logia with the stamina he has, can afford to make mistakes and get hit a few times as he did.
Because Jozu lost when he was distracted by Marco and Aokiji took the opportunity the surprise attack him. Had there been no distractions just a 1 on 1 fight, things might have gone differently, although at the end of the day I still would slightly side with Aokiji.