FreeBSD
GhostBSD
Ubuntu
FreeBSD for servers, GhostBSD for UI desktop, Ubuntu for a BSD Kernel with a Linux userland.

I first used Unix at the University of Waterloo; a guy I'd worked with at Teklogix had sold them their PDP 11/45 and in fact he sold the same one to about eight universities who had to get it in this years budget as received, so hew ran around, they'd sign for it, then he'd take it on to the next place. Eventually DEC had enough machines that they all got one.

That's the machine I first used at Uniwat, a PDP 11/45 running System III I believe, this would have been the fall of 1978, by the spring of 1979 I got a contract to port TROFF from BCPL to C for the Waterloo Typesetting Task Force for A grad student named Rob Beach, who I met at a computer graphics conference in Anaheim (Along with Charles Bigelow and Michael Stonebreaker)

FreeBSD

FreeBSD was installed on my first server in 1995 or 1996. This was used to maintain compatibility with the Unix system I'd been using for a decade at that point run by Brian Reid in his Garage. Version 2.2.1 lasted nearly a decade without any need to upgrade,


GhostBSD

GhostBSD is roughly a Mate UI desktop on top of FreeBSD, the first viable attempt at this. There are also significant disk handling improvements over FreeBSD. THios casme out around 2020 or so, OI began using it amount the spring of 2024 and like it.


Ubuntu

Based on a BSD kernel, the gnome/userland experience with Ubuntu is rather good and is available as fresh install ISO or an upgrade to an already installed Ubuntu system. 

sudo apt install ubuntustudio-installer


In Ubuntu 22.04 LTS, this will bring in other tools, such as Studio Controls which is required for audio configuration prep, which is done after Ubuntu Studio Installer has been run.