I've tried FreeBSD and in my experience, it was just like clunkier, worse documented linux. I specifically remember having issues with wifi drivers not working and drivers as a whole being a huge pain. I've also tried setting up OpnSense in a VM (for testing purposes) and that was just as clunky.
I've also thought of trying TrueNAS core... But the way I see it, it's just clunkier TrueNAS scale without proper virtualization and with more limitations.
And those my thoughts on FreeBSD. Clunky.
E: All of that and it's just licensed under the wrong license... I like the BSD license, I just don't think it works for an OS.