I use both: GNOME works better for a desktop, KDE Plasma works better for a laptop.
There are more than those 2 options for a Desktop Environment, by the way ;)
Doesn't really matter for 90% of cases, best bet is to go for what feels good for you. Each distro is similar to each version of windows, they are a little different from one version to the next, but for the most part it just changes how you interact with it.
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0