While many hosts prefer the ease of hosting on Windows servers, many also like the stability and security of Linux and FreeBSD servers. What server operating system do you use? Why do you prefer that OS?
Linux is an open source and free too. It has been considered as the best OS for Web servers. It is the most reliable, stable and efficient system used for the Web and mail servers. All web servers are configured to support HTML files and JavaScript. There are many other type of Server Side scripting and interfaces, including PHP, ASP and ASP.net.
We always recommend Linux, for both web hosting and gameservers. We choose CentOS to be the operating system on all of our servers because of the low usage of CPU, and high stability
I am using Windows for a couple of years. But now I'm on my way of learning Linux. I think it is more advantageous than windows though at present it seems so complicated for me. One thing more you can have this OS free.