“December’s top ten list is dominated by FreeBSD and Linux, with the exception of Windows specialists Server Intellect (fourth) who have the only site running Windows.”
see Most Reliable Hosting Company Sites in December 2012 | Netcraft.
People who have choice choose GNU/Linux by far ahead of that other OS. Why don’t you? I recommend Debian GNU/Linux because it keeps working and working and working… on desktop or server.