Stick to Windows unless you plan to get a managed hosting in Linux. I have a decade of experience too in Linux - but many a times, it takes a lot of time for me to change some thing in a Windows machine. Administering linux through CLI is second nature to people used to Linux. For windows it is all a matter of clicking on the GUI. These days you get GUI tools for linux too - Webmin.

In a mission critical situation, you will be better off doing what you have been doing all these years.