Use what you like and feel most comfortable with. I maintain several hundred servers all of various flavors, Windows, Linux and Mac and am happily doing it from the OS I feel most comfortable with, Linux Mint. If I really need to use Windows, I have it as a VM in VirtualBox, or I can RDP into any of various terminal servers. Though I have found, that after a decade of using Linux through all it’s various iterations and distros, it’s as comfortable to me as when I first fired up Win95 and had to go through yet another learning curve figuring out where everything was! I guess a secondary point would be that these discussions would be way more interesting if you could remove fanboy ego entirely. Just because you don’t use Windows doesn’t make you an elitist. I’ve been in this industry 10 years and provide solutions for what my customer wants/needs/feels comfortable with. My only argument against Windows is if I have to remove another AntiVir 2010/Security Center/[insert name here] scareware infection, I might just pull what little hair I have left out!