Well, Akainu if he had the exact same physical condition as Marineford Whitebeard then he would arguably do better in such a hypothetical scenario.
For one, him being a logia means that he would not have the same problem in evading the hundreds of bullets and dozens of cannonballs that were shot by fodder, that Whitebeard had to endure due to him being limited to his solid form.
The other thing Akainu has to compensate for his deteriorating body up is Rokushiki, the most insanely useful martial art in One Piece.
So yes, a hypothetical MF Akainu would perform better than MF Whitebeard. After all, a large part of Whitebeard’s arsenal revolved around his physical strength (World’s Strongest Man) which deteriorated while Akainu’s arsenal is more reliant on his devil fruit abilities which do not deteriorate with age.