Comment by ericcope

I've read that CentOS is the best Linux distribution for public facing applications because they take security very seriously. If you choose Ubuntu, use the LTS version so its not moving so frequently but still maintained. I use CentOS and Ubuntu for my web apps. I don't use Windows because my apps are all LAMP based and switching to Windows offers no benefit. If your Application is .Net based, you pretty much are required to use Windows (unless is Mono compatible)...