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For mindless Destiny Xbone playing, Windows 10 is great. (Destiny)
For serious. If you're playing by yourself, it beats the snap app hands down. You can play, get your bounties/level up them dumb guns, watch a documentary and read HBO, all on one screen. You don't have to have the über nerd set up of the TV there, then the PC next to you and a swivel chair.
Now, you can kill time while you're killing time!