I would say, in the 80`s, the Flanker's are been a danger. But now the F-16 or F-15 beat those handful upgraded "Flanker's" with just the technology, what we see in the current US or MLU NATO planes.
And when it comes to the point where the pilot makes the diffrents, between the win or loss, then I would say NATO or US pilots with the fact that the have much more training and flyt houre's.