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Re:Ubuntu 16.04: “Out of memory” errors after upgrade to 4.4... by StreamBright on Sunday January 29, 2017 @04:11AM (#13513221)
FreeBSD is actually a much cleaner operating system than other unix-like clones. I have used it for a decade but my work required me to use linux.

Best parts already mentioned in this thread (pf, jails, etc.) I would add one thing to the list:

https://www.freebsd.org/cgi/man.cgi?hier(7)

Re:Ubuntu 16.04: “Out of memory” errors after upgrade to 4.4... by JdeBP on Sunday January 29, 2017 @06:23AM (#13513656)