I enjoy 1989 Batman for nostalgic reasons, really liked that movie as a ten year old.

Batman Returns was also enjoyable, but doesn't hold the nostalgic value of the first. Enjoyed me some Walken and Devito. Plus, by the time this one came out, I was in the full swing of puberty, so Michelle Pfeiffer hold a nice leathery place in my heart as a result of this film.

Anything by Shumacher was utter crap. Never liked any of them.

Batman Begins was extremely enjoyable and a great film.

I'm gonna have to go with the majority here and call The Dark Knight my very favorite of all. I just love Ledger's Joker, his characters true devotion to Anarchy and chaos was a sinful enjoyment to me. His quirks and behavior just enthralled me. I hate we'll never see Ledger's Joker again. *tear*