I have 2 A-Wings, and I can't really see using more than one at this point (i.e., to make a 4 ship Rebel build). I don't usually play Rebels, so am probably just missing something. But, when I play against them I don't see a lot on the board and they often go quickly.
I have 3 TIE Interceptors so I can do a 3 TIE (including Howlrunner) 3 TIE Interceptor squad. It's been pretty tough so far. Gives me one more attack dice per round than in a 7 ship TIE squad (my old favorite) as long as I can keep them around (but 3 less hull as I have to give up a ship to include them).
I think I have as many or more of each as the several folks I play with. How many do you have and why?