This is a good one, Klaus.
I'd go for any except the comic anime, the action traditional, and Simpsons (a joke, I presume).
The style isn't the issue so much as the flow of the movement. If you notice with the DC stuff, the art is extremely stylized, but the animation is often seamless and flows well. They look like they're really moving. However, I know that a lot of people aren't partial to that sort of thing. I would place almost anything from Tartavosky (I think that's the spelling), like Samauri Jack or Star Wars: The Clone Wars in this arena.
I steered away from action traditional primarily because it's been my experience that when there's an attempt to capture anatomical and physiological accuracy, the quality of the animation suffers and/or is inconsistent from episode to episode. This was the case with the original X-Men cartoon. If the standard was maintained, I could go for it.
Finally, I noticed that you didn't include Disney-style animation... Although one could argue that there are different styles within a larger group. If I had to pick, I'd go with the angular elements presented in Sleeping Beauty and, to a lesser degree, in The Hunchback of Notre Dame, Aladdin, or Pocohantas. I despised the direction Disney went with Hercules (particularly the story).