Nearly all jet aircraft use a variety of Kerosene (yup heavy diesel...). The reason is that hydrocarbon fuels contain more energy per liter as the molecular weight goes up. (This is why a diesel car can go farther on a gallon of diesel than a gasoline car can). Still heavier fuels are not used because they take too long to pre-heat for engine starting (and the plane sits on the ground...)
As for which plane is a better (or tougher) aircraft, the F-16 is designed to get into the air quickly for rapid response. The F-22 Raptor carries more arms payload...and goes faster... but does not scramble as quickly. Once both are in the air, I'd bet on the F-22.

Decide for yourselves who would win an engagement - Check out the sites:
F-22 http://www.af.mil/news/Apr1997/f22/index.html
F-16 http://www.af.mil/news/factsheets/F_16_Fighting_Falcon.html

I was in the Air Force for a while before I went to college.Both jets use a derivative of kerosene for fuel. There are different types; a couple called JP-4 and JP-6. The fuel isn't the important part of the aircraft as much as the "accessories". These are things like range, weapon capacity, guidance systems, etc. The F-16 is a no-frills fighter--not as fancy as the F-22. It is cheap and often sold to poor countries. This doesn't mean that it is inferior; just that it is appropriate for less high tech work. You should keep in mind that when a military force is built, no single part of it, whether it is a tank, gun, fighter, or bomber, is really the "best". This is because it is the collection of weapons that makes the military. The military is more like a set of tools with each having a particular job to do. There is really no single piece of hardware that is the best for all jobs.