would there be any advantage to using rsync to moving the contents of a folder A, to say, a folder B, with B being empty?
I've found myself in a situation where rsync IS faster than mv simply because mv cannot handle the number of files in the directory. I have 1.8 million photos from a security camera that ran for 20 days and the mv command exits with a failure because it cannot allocate resources.
rsync however, seems to handle all the files without a problem.