"Axel F" is a great song in general. The orchestral-like variations on it were one of the only redeeming aspects of the third movie.

I guess I like the first one best. The concept was fresh with the contrast between Detroit and Beverly Hills, Axel needing to prove himself to Taggart and Billy, etc. There were also plenty of scenes of Axel talking his way in and out of things, which is a big part of his character's appeal that was unfortunately eroded as the series went on.