What is the best jet fighter?

There is no fighter jet that is the best. Each fighter is designed for a purpose like reconaissance or air support. The Fairchild Republic A-10 is probably one of the best close ground support fighters. It incorporates the GAU-8 Equalizer. It will turn a house into a crumpled mess. The SR-71 Blackbird is probably the best Reconaissance fighter due to it being able to cruise at 80,000 ft with a speed of Mach 3.2. The Hornet and Raptor are also well recognized due to them both being all-weather, multi-role, supersonic fighters. The F-35 Lightning II is set to be part of the new fleet of aircraft the Air Force will purchase. It is a fifth generation multi-role supersonic aircraft with stealth technology or (LOW). It is also capable of V/STOL which allows it to take off like a helicopter vertically with only a little bit of forward thrust. If you have ever played Call of Duty you will notice the Harrier will hover over an area. This can hold same true in certain battles to come for the F-35 Lightning II. Also, the Eurofighter Typhoon is modern with high speeds and Excellent fighter-bomber qualities.

It is really for you to decide.