Most artists upload their works to multiple websites, and often those different sites have differing rules on censorship. By which I mean pixiv requires censorship while twitter, newgrounds, hentaifoundry, and pretty much every other site doesn't.
With the reason that censorship sucks, uncensored versions should be preferred, and should be considered the "best" for the purpose of parent-child relationships, but this is not even mentioned on the help page. I think it should be prioritized somewhere probably below Unsampled and definitely above Most lossless file format.