From what I understand the SU is bigger, has more range, and can top out a little faster than the f-16. It also has thrust vectoring so it can maneuver pretty well in a dogfight.
The f-16 is cheaper to run and more reliable, and since it's smaller and lighter it's hard to spot and can still maneuver with the best of them.

Oh for sure that's mainly obsolete, I'm just stating the main differences that I've read about them.