I primarily use OS X, but I do have a Windows machine that I use for some development. My reason is not in your list: I need to create Windows executables and

I primarily use OS X, but I do have a Windows machine that I use for some development. My reason is not in your list: I need to create Windows executables and installers as part of our product and don't know of a way to do that on OS X. If that was a larger part of my development, I would primarily use Windows.