"cgi or "real" aircraft?"
Good question. Unfortunately the answer is "both".
CGI done well isn't a problem.
For CGI done badly (among many other problems) I recommend looking at the fairly recent Pearl Harbour film.
Everything, but everything, in that film was crass, unrealistic and bloody awful.
In particular, the "compression" of aerial combat sequences gave the impression that fighters got within 10 yards of each other! 100 yards would have been considered close!
Problem is, that doesn't look good on screen - at least for hollywood.
FBW