If I were hiring, I'd give special preference to Mac and Linux users.

Not because you can't learn Linux on Windows but because using Linux is usually a sign that the person is not afraid of a little discomfort, not afraid to learn more about the computer they use and willing to accept change and even willing to try new things.

Linux represents a different mindset than Windows and for me, it's very easy to tell who loves what he does and who doesn't, who loves a challenge and who doesn't, who can get stuff done in any situation and who doesn't. All because I used to be a Windows user and I can easily compare the mindset that went into justifying sticking to a difficult OS.