Well, I don't like anime either, but I like westerns. There you go. If you can't tell that the 3D one is the stiff one and the 2D one is dynamic one, too bad, because it's right in everyone's face. As Stravinsky, Duke Ellington and Miles Davis said a million times: the importance of pacing, which involves knowing when to not do anything.
Of course, this all might as well be greek to the ADD generation. :V
If I can't tell it's stiff? I was kind of sure I said something akin to 'a few glimpses of them making small gestures outside of attacks' and fluidity can be stiff. If that doesn't make sense to you my apologies.
And in saying "the importance of pacing, knowing when to not do anything" etc part is purely personal preference. Are you saying that someone who prefers smaller pauses, longer action with less 'flair' is wrong? What about someone who likes exceptionally long pauses that can take upwards of 15 seconds of "flowing cape in the wind" moments before they so much as retract into a "ready" stance where they wait another 10 seconds before doing more? Though I cannot recall it directly offhand there are ancient poems or plays with large deliberate blank spots to which the audience is to close their minds and simply focus on the emptiness.
So, then, the 2D one is dynamic? They use a lot of common animation techniques to look like more is going on while not having to do as much. Common in all animation, 2D or 3D. But watching the camera pan while the same 5 frames of animation play for several seconds and then a zoom in while the same play again or the screen shaking while barely anything of note happens as far as the animation doesn't strike me as being very dynamic at all. Just simple animation in 2D with exaggerated, artfully distractive pauses.
Also, I am not a big fan of western animation either...
Maybe I just don't like "animation" in general.