The FC3 pack. I bought it with the 50% discount for the first purchase together with the F/A-18, F-16 and F-14. I much prefer the clickable cockpits and have really only tried to fly the F-15 and A-10, the combined time of which would be less than 1 hour.
Of the three, the F-16 has seen most use. Recently I'm all in on Mirage, so the F1 and 2000C get most of my airtime.