I'm currently obssessed with watching Batman: The Animated Series/the New Adventures of Batman/The Adventures of Batman & Robin (which are all technically the same series, just renamed between seasons) on YouTube.
There used to be a back-to-back hour of Batman/Superman TAS's when I was a kid so this is basically reliving my childhood on YouTube. =P
I always liked Batman more than Superman. Superman always seemed like too much of a goody-two-shoes, especially the mild-mannered reporter aspect. Bruce Wayne was a confident and aggressive businessman/playboy millionaire in addition to his strict training regiments to be Batman.
And there was always all those psychologicals aspects of it, like his childhood trauma and how all his villains are literally insane.
My favorite episode was Girls' Night Out, which featured an all-female cast with Supergirl and Batgirl teaming up against the combined forces of Poison Ivy, Harley Quinn, and Livewire.
Here is part 1:
And of course, Part 2: