Animated. Ledger's Joker was good, but he was necessarily limited by his format. He could only ever embody one thing, and Nolan went with anarchy. Perfectly valid interpretation, and it worked well in the context of the movie. But Timm, Dini, et al. had a much larger canvas to work on with the animated Joker, so he more closely reflects the comics' ambiguous, ever-changing nutjob. Granted, I still wish we could've seen an animated version of something like Gotham Central's "Soft Targets," where the Joker literally just shows up on a rooftop with a sniper rifle and picks off random people and then disappears again for no discernible reason whatsoever, but that's a pipe dream for another day, I guess.