Well, to be honest Linux is used extensively in the modern hosting world... and when looking at strictly at the facts, it is preferred over Windows (in this realm at least). Why? Well it could be because of the hosting software control panels available to the Linux OS, or it could be because people are more experienced with remote administration of Linux than that of Windows. Further I disagree with anyone saying that Linux is more secure then Windows, or vice versa, a server’s security lies within its administrator. In my experience I have enjoyed Linux more then Windows, simply because I find it’s easier to move around in and customize… but hey that’s my opinion. Every OS has its holes and vulnerabilities, a server’s security all depends on how active and skilled the administrator is