I'm a big Batman Begins fan, and full believer that it's one of the best-written modern blockbusters when it comes to theme. If I could point to *one* blockbuster as the perfect example of how to weave theme (in this case, fear) throughout each and every scene/character, in expert fashion, it would be this one. I love this movie, and how it takes a lost man from Bruce to Batman, beautifully setting up a sequel via one of my all time favorite final scenes (Gordon giving Batman the Joker card).
That said… I've probably watched The Batman at least six times in the past year, if not more, and have sought out certain sequences north of twenty times. I don't know what it is, but this movie reaches deep down in my soul in a way few blockbusters have. That's partly due to it featuring some of the best cinematography I've seen in any blockbuster, along with the amazing score, which might actually beat out Zimmer's for me (something I never thought possible), and then the story itself, which I appreciate and fall in love with more and more each time I watch it. There's just so much care and empathy that goes into the storytelling/characterizations, and I also really dig how Reeves manages to make an entire movie not out of Bruce becoming Batman, but Bruce becoming the Bruce Wayne he needs to be.
Honestly, asking me to pick one is like making someone choose a favorite kid. Gun to my head, though, I'd go with The Batman. But more than anything I love that *both* of these movies exist, and can be appreciated/watched, depending on my mood/preference, seeing as they compliment each other in really awesome ways.