I'm not going to start a flamewar. Please respect my objective opinion. I will respect your personal belief.

http://people.freebsd.org/~murray/bsd_flier.html

http://www.cvedetails.com/vendor/6/Freebsd.html

http://www.cvedetails.com/vendor/33/Linux.html

Not only freebsd has less vulnerabilities, but they are also less serious (check exploit or data execution)