The advantages of UAVs are massive, numerous, and obvious.

The only military advantages I can really think of manned fighters would be the increased situational awareness of a manned craft: the pilot has a panoramic view of their surroundings thanks to the fighter's canopy and being able to look around. Although, this seems like something drones could achieve relatively easily, providing a 360 degree view to their remote pilots.

Manned craft also have the ability to function autonomously if communications are down due to jamming, I guess? Drones could proceed toward a preselected target even without comms, of course, but a based on my layman's understanding of air combat decision-making is a huge element of combat flight. Things are messy, confusing, and ever-evolving.