The different "versions" of GNU/Linux are called distributions. I like to "distro hop" a lot trying new ones, but my absolute favorite is Ubuntu MATE. I like the LTS versions which are supported for several years and the current one is 14.04.1 LTS. You can check it out here...
https://ubuntu-mate.org/longterm/
https://ubuntu-mate.org/about/
And it is GNU/Linux--not Linux. Linux is just the kernel. GNU is the set of programs therefore the operating system is GNU/Linux