One of the advantages of the SP/Desktop combo over the SP/XBox is Steam's in home streaming. You can play your desktop Steam games on your SP3 anywhere your home network reaches (and not tax the SP3). Plus, the Dualshock 4 controller works great with the Surface (using ds4windows). If you still want the big screen experience, you can stream to the SP3 and then connect the SP3 to your television.