I cut my teeth on FreeBSD and BSDi long before Linux, and Solaris was always this solid, go to OS for prod databases and firewalls.
HPUX - I guess it was ok running OpenView when it would actually not panic
Irix - Terribly insecure but very pretty. Still have an Indio2
AIX - Meh. Everything abstracted away via smit and its brethren
Tru64 - Never really minded using that for Oracle and didn't need to pay Veritas for a clustered file system
If you want a walk down memory lane: https://winworldpc.com/library/operating-systems
I am not affiliated with the site and I have no idea if you can legally download this stuff.
> Members of the subculture typically do not self-identify as hipsters