｢ There are some nice things about FreeBSD, like root on ZFS, and broadly I feel that it's more friendly than OpenBSD. But those are secondary to its firewall network performance (and PF compatibility); if its network performance was no better than OpenBSD (or worse), we wouldn't be interested. Since it is better, it's now displacing OpenBSD for our firewalls and our latest VPN servers ｣
https://utcc.utoronto.ca/~cks/space/blog/sysadmin/OpenBSDToFreeBSDMove