I've used Slackware, Mandriva, something or two or three handed out at
OCLUG meetings around the Corel Linux era (does anyone remember their
names?), Redhat, SUSE, Debian, and Ubuntu.
I haven't switched from Ubuntu for about 6 years now on server and
Kubuntu on desktop.
For me, it's been reasonably up-to-date, rarely broke badly, and worked
well enough. As for choosing Kubuntu - it was better than gnome at the
time, and now it's intertia. :-)
I recently upgraded my web/dns/list server from from Ubuntu 16.04 to 18.04
LTS Bionic Beaver to get recent versions of apache, wget, php etc. which I
was installing from PPEs (alternate repositories). The upgrade went very
smoothly. I quickly ripped out netplan, "The network configuration
abstraction renderer" (bleah!) after installation though. netplan.io is
one of those bad choices that sometimes come with Ubuntu, I'll admit.
I reinstalled good old ifconfig, which took about 5 minutes and others
have already provided instructions for.
Of course the great thing about the Linux ecosystem is choice and
customizability.
Brett