well i really enjoyed Batman begins..genuninely impressed..but i would have to say both of the Burton films are fantastic, i love the magical quality and the eerie feel and the way the characters come across. Hard to choose between the two. Keaton suited the role of Batman AND Bruce Wayne(which i think is quite important) really well. he was definitely the best.
However if i was to totally honest I have a very big soft spot for the 1966...Batman:The movie! i think it should be added to the list..classic 8)