What is the difference between an Xbox One S1, S2, and X1? Are there games that only play on X1, and is there some other benefit for getting one over the other? -
Xbox One vs. PlayStation 4: Which game console is best? | Extremetech
PS4 vs Xbox One Specs
The Xbox One and PS4 share similar specs, but the devil's in the details | Ars Technica
What Is the Xbox One GPU Equivalent to? [Explained] - Alvaro Trigo's Blog