eX-Driver has superior cars (Lancia Stratos FTW!), superior chara design, but the story IMHO is a bit lacking. (no, I don't consider Initial D to be the pinnacle of storytelling either, but I feel eX-D could be a lot better) Also, eX-D the movie was ... how to say it... poor. Both in animation (early CG... *shrug*) and in plot.
As for music I prefer eX-D, but I recognize that my taste in music may be unique here.