Batman has the most hearts

One of the reasons why I think he's up there is because he's always on the home screen, so it's easy to not forget him whenever you log on to the website. If Batman was taken off for a little while I think another hero would replace him in the amount of hearts he succumbs.

Its kind of debatable which hero is more popular but it was always going to come down to those 2.
Batman is seen as more relatable, cooler and has deeper stories. Superman can be seen as boring.
While Superman may be the face of DC, in some ways Batman carries DC. If it weren't for Batman, DC would be in a far weaker position.