What is the difference between the Xbox One S and One X?
The Xbox One X is a more powerful console. While the Xbox One S can upgrade 1080P games to 4K it is not a true 4K console.
Are all Xbox 360 games compatible with Xbox One X and One S?
Select Xbox and Xbox 360 games are available in the Back Compatibility Game Catalogue. The digital titles that you own that feature Back Compatibility will automatically show up in the “Ready to Install” section on your Xbox One.
What memory does the Xbox One have?
The Xbox One S and One X boast two variants of interal memory: 500 GB and 1 TB. Some of this memory will be saved for pre-installed games and apps, console software and system functions.