If you're planning on purchasing Metal Gear Solid V: Ground Zeroes and The Phantom Pain and have both an Xbox One and PlayStation 4, you're likely going to want to go with the PS4 version, as it looks "slightly better" on Sony's console.
This news comes from Game Informer, who reports that Ground Zeroes "looks slightly better on the PS4 compared to the Xbox One." Not only that, but it appears series creator Hideo Kojima agrees. "Kojima notes that MGS V looks slightly better on the PS4 compared to the Xbox One, something we also noted before he mentioned it."
So there you have it. While it certainly shouldn't come as too much of a shock considering PlayStation 4's edge in the technical department, it will still rile up fanboys nonetheless.