What is better a fighter pilot or a drone?

What is better? A sports car or an SUV?

Depends on what you're using it for, right? If you want to race, then obviously you get a sports car. If you want to go off-road, then you use an SUV.

Currently, drones are designed not as fighters, but as reconnaissance and attack platforms. Fighter pilots today can easily engage in dogfighting or attack missions or recon with the flip of a switch. However, their time in the air is considerably less since their high performance aircrafts consume way more fuel per minute than most drones.

Also, drones like the Predator and Reaper would not be effective against a modern military since they are basically defenseless. They have neither stealth nor weapons capable of self defense (at least ones that are known). A fighter pilot can go into hostile airspace and defend himself/herself if need be.

Currently, fighter pilots. Eventually, drones. As of right now, manned aircraft are superior to drones. The reason drones are popular is they are cheaper and you you can have them do a mission that is relatively dangerous with-out loss of life (because they don't have human passengers the space can also be used to carry extra fuel allowing them to stay in the air longer).

There will one day come a time with you see an air superiority fighter that is a drone (way in the future). While we can design an aircraft to do many amazing feats a manned aircraft is limited by the "human" in the cockpit. Reaction times, ability to handle g-forces / stress etc. are all limitors.

Right now, a fighter pilot. Humans are much better at reacting to unexpected situations and coming up with creative ways to solve the problem. That will probably change in the future, but will probably require another quantum leap in computing, much like integrated circuits were.

At least drones don't have to pee.

This, like all unspecific "Which is better" questions, is entirely dependent on the situation.