It depends.

In a lot of cases unmanned craft are obviously superior.

But by the time you load an unmanned craft up with a powerful radar and multiple bombs and missiles - you're also not that far away from the size and expense of a manned craft.

The radar is something you might not appreciate. Modern fighters have very large and powerful onboard radars and a lot of onboard processing power. They are not just bomb and missile trolleys, they are powerful sensor platforms.

Think about it from another perspective. Scroll down and look at the cutaway drawing of an F-16:

https://www.flightglobal.com/defence/why-lockheed-martins-f-...

...clearly, a signficant portion of the plane is dedicated to the pilot. But honestly, not that much. Strip away the cockpit and how much smaller is the plane? 20-30% smaller and cheaper?