I know that some people say that the animation in the actual show is much "cleaner" and more "consistent", but the pilot is definitely more expressive and fluid.
And I'd still argue the animation in the show isn't the greatest anyway. There are so many errors, with lines missing, spots being uncolored, and just many other issues. There's the infamous "Vaggie disappearing in the next frame in the first song", but there are also just many scenes where the error can be easily fixed or it took more effort to produce said error.
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All they had to do was copy Vaggie from the first shot and place here in the next one. It took more time and effort to redraw here in the exact same pose.