What about Unbuntu?
You mean Ubuntu? That is a distribution, which is different from a desktop environment.
Good question. I’ve been using Ubuntu on my desktop and laptop for over a year. It’s fast and rock stable, and has a good interface. Easy and simple to use.
Ubuntu uses the Unity desktop in the listing.
because these are desktop environments not distros.
Ubuntu is a distribution—a particular "brand" of Linux, if you will. What this article is describing is various desktop environments: the software that defines the look and feel of your desktop.
Ubuntu has official and unofficial releases available that default to one of nearly all the desktops mentioned above. What isn't officially distributed, is fairly easily downloaded and installed. I use Kubuntu, myself—Ubuntu with the KDE desktop: