High Imperial Roman army vs Late Roman army

[Flavivs Aetivs]

Now now Robert, its obvious the glorified hollywood actors in their plastic segmentatas would win :-P

In all seriousness, Robert is right. You really can't compare the two, although I will maintain that the commander of either side would be the only comparable factor.

Although I would argue that if Aetius was commanding, the Huns would tear a Principate Army apart.