How/why do you think Batman has overtaken Superman in terms of public popularity?

Superman, Batman, and Wonder Woman are obviously DC's cash cows and really always have been, but it seems to me that the gap in general popularity (not necessarily among avids) between Batman and the rest of the DC pack, including his fellow big 3 members, is really large. Whether it's because of the late 80s/early 90s movies, the Nolan trilogy, or the success of Batman: The Animated Series and/or Batman Beyond, the character has really been separated from its peers over time in terms of popularity among casual fans. Why do you think that is? What is it about Batman and/or his representation in media that has created such a sizable gap between him and Superman?

I ask this question as someone who would also like to see more Wonder Woman media, but that's not the question lol