Um. They have been VERY clear about it. VR will only be supported on the Scorpio. Which will be superior then PS VR.
Otherwise. It works JUST LIKE GAMES ON PC. Why is this so difficult for people to understand when it has been done for decades now.
Games will run at 720p/900p/1080p with shorter draw distance and inferior textures, shadowing, lighting, lower FPS on Xbox One
Games will run at 4K(native or other technique) with longer draw distance, suprerior textures, shadowing, lighting, better FPS on Scorpio.
Its not just about "resolution bump". Games will LOOK better on the Scorpio vs Xbox One and PS4 Pro. If that and a better console VR experience matters to someone beyond "exclusives" then the Scorpio would be the better choice.
It matters when you have quantity/quality games on your console.
And lately Xbox One seems to need both.