* Ease of management - more holistically designed.
* Rock solid parts that fits together - more holistically designed.
* ZFS, jails, bhyve, dtrace, ports.
* If it works today, it works tomorrow.
* A more approachable community (which AMD says is the reason why they are developing for FreeBSD before Linux now).
* Transparency and simplicity of how it works - if you can understand it, you can manage it and fix it.
* Documentation.
* Fun! Linux is not fun.