This blog by Vermaden is probably one of the most cited in the FreeBSD community when someone in a forum/subreddit asks why FreeBSD. I think it does a good job encapsulating the reasons one would choose FreeBSD over Linux or other OS’s.
I’ve become more partial to the *BSD’s in the past couple of years and respect what each one brings. I do daily drive Debian tho ;)
It’s a good os, even if it is lacking in some ways compared to linux. Boot environments/ZFS is pretty great.
I also appreciate that FreeBSD is slower to change, and won’t change just for it’s own sake. Features are thought out and added with care. Linux is obviously a little fragmented, which means development happens quicker and newer features pop up, but then there’s the issue of things breaking, or distros make big changes that force users to find another distro. (Think of the change redhat made to CentOS for example).