I recently switched my personal box to FreeBSD. I honestly find it significantly easier to manage than Linux, and have greater trust in its reliability merely from its simplicity.

The single biggest thing which stood out for me was PF (from OpenBSD). Anybody who has ever had the grace of managing IPTables on Linux, give PF a go with /etc/pf.conf (docs: https://www.freebsd.org/doc/handbook/firewalls-pf.html, my config: https://github.com/jamescun/infrastructure/blob/master/roles...).