Batman 89 for me, without any doubt. Sure, it has the Prince music and Kim Basinger is not the hell of an actress, but it was plain old good fun, and well, the first superhero movie that added darkness and a touch of realism (movie is not realistic, but at least Batman wears something for bullets), also the first sh movie that gave the villain some importance, other than the comic relief. It was also the first that considered the psychology as part of what makes the character exist and behave the way they do. The action is great, the acting too. For me it's still a 5/5.
Begins was a great proposal, great tone and the seed for a whole new take on superhero movies, but it had way too many problems that I've mentioned in many other threads. Action: you cannot see Batman in action. Dialogue: repetitive, preachy, unnatural, the monorail train with little Bruce Wayne is a perfect example of how not to write any scene ever. Villains: even when Ra's was good, Scarecrow was turned into a joke, a joke that would come again and again in the sequels. 3.5/5
(Although TDK is for me another 5/5).