My (highly arguable) arguments:
BSD's codebase is a lot more stable and organized, and it has been around for more than twice as long as Linux. There aren't as many different versions/distros around, than Linux has. BSD itself seems to be slightly faster and more stable than Linux when the system is under full load, too.
What I really like is the modularity. The minimal base system is kept away from all the modules in BSDs. The portage system is, in my opinion, the best way to handle them. There's less problems with dependancies. Everything can be easily updated. Looking at previous posts: it's all that Gentoo is, and much more.

I haven't ever had any problems with any hardware in BSD. In Linux I've had problems with drivers that weren't as stable as they should be.
And last, but not least: even Hotmail uses/used FreeBSD systems for their servers. They could've used Linux, or their own systems, but they chose BSD. Why shouldn't you? ::)