In a presentation at Ubuntu Developer Summit currently going on in Denmark, Drew Bliss from Valve said that Linux is more viable than Windows 8 for gaming. Windows 8 ships with its own app store and it is moving away from an open platform model.

via Valve: Linux More Viable Than Windows 8 for Gaming ~ Ubuntu Vibes | Daily Ubuntu Linux Updates.

Ubuntu is preferred platform as it has a large user base and good community support with a strong company like Canonical behind it.