I am a OpenBSD / Windows user (all the VMs server I am running are OpenBSD). I haven't used FreeBSD a whole lot.

1) You get an operating system. One of the problems with Linux is the number of distros. If you want to know how to do something you've got to google around and look for a guide. In the BSDs it is just reading the man pages and figuring things out from there.

2) I've found with OpenBSD things either are documented and work or they don't work at all. The system is easy to understand whereas with Linux I tend to get overwhelmed with one distro doing it one way and another distro doing it another way.

3) Things are a bit difficult to setup (lots of reading docs) but it doesn't change once you've got it running which is my major gripe with Windows since Windows 7.