I'd say Fedora KDE. It just works, the docs are good, it has a big community and large enough repos.
Linux
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.
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Debian or Linux Mint
Arch would actually stand a chance.
Trisquel is a fully 'Free as in freedom' distro.
Zero telemetry now or in the future.
Ubuntu based, so large FLOSS package repository.
Mate UI, simple user friendly layout.
* You will need hardware that works with fully free hardware drivers (for printer, WiFi, GPU etc). Drivers with binary-blobs are not included, due to potential security risks or spyware.
Test your hardware with a bootable USB.