I definitely read in a review or feature at the time that at least some viewed Chita's performance as more dance driven and Williams as more vocally driven. Maybe even suggesting that some dances were shortened for Williams. There are certianly some missing dance music on Williams recording, but I always thought it was just eliminated, on the recording, to make room for more dialogue and the final Over The Wall (Lucky Molina) that we don't get on Chita's recording.
I think "superior" is very subjective. I strongly prefer Chita. But Vanessa has a smoother sound, for sure. Although that doesn't equal better. On her pop songs I am VERY much a fan of Williams.