Lol it's not fair comparing those two scenes when you're effectively showing one of the climax scenes that is supposed to have much more smoother animation, compared to a exposition scene to showcase how Mumei fights.
Plus that scene wasn't even that impressive since a lot of it was still frames of them pulling out their blades and the aftermath of the slices. A better scene would be when Levi fights her.
For a much better Kabaneri fight scenes animation wise, the fight ontop of the railcars was better.
Plus the scenarios for each action scenes are different, one is gliding through the sky with the 3D gears while the other is a much more sluggish heavy steam engine terrain battles.
On another note, finally got around to watching Shinsekai Yori, and damn despite the slow start, the world is so fascinating, how could I have dropped this 4 years ago?