Contrary to what others here have written, FBSD is no more 'fiddly' than any other server class OS. It is faster, smaller, and better conceived than linux - which is a achieving Microsoft-levels of accretion and cruft.
Moreover, FBSD is not constrained by the execrable GPL and its variants, uses a far more modern compiler chain, has better release control, etc.
I do use Linux as well - both professionally and for my desktops. Linux is a worthy replacement for the desktop, but Berserkely is an overall more solid server platform.