Batman: The Movie-Honestly, everyone in this movie does a great job with their respective characters, and this film feels more like an ensemble than a Batman-focused film. However, Id say Batman is the highlight of this film because the two most iconic scenes in the movie revolve around him. And they wouldn't be as iconic without Adam West's classic interpretation of Batman.
On another note, Ive seen some folks mention that Joker always steals whatever movie hes in, but right from the start of Batmans theatrical history, we see this isnt the case. Not only is he not the highlight in terms of overall characters, hes not even the main highlight among BtM's villains. In terms of story, Penguin is clearly the leader of united underworld, and in terms of performance, I personally think Frank Gorshin was the best villain.
Batman: Mask of the Phantasm-This was Batmans film, not only from a narrative standpoint, but from a performance one as well. Just as he did on TV, Conroy proves himself to be a great leading man in Batfilms as well.
Batman Begins: Not surprised this is winning the poll. This is arguably the best presentation Batman has in the Nolan trilogy. Whereas in the other two movies, Batman has to be knocked down a bit to build up Joker or Bane, Batman feels like more of a dominant force in BB. Christian Bale does a great job portraying the various parts of Bruces personality and life.
The Lego Batman Movie: This movie gives us one of the best looks into the psychology of Batman, and is yet another good example of how Joker doesnt automatically steal the show from Batman all the time. Lego Batman is a very showy performance, which is a big reason why he stole the show in the Lego Movie, and is a reason why he is the highlight of Lego Batman.