Its just perception; a psycological thing.
The experience is not realy going to be any better just by adding a few pixels. The PS4 & X1 versions both run the same assets (same textures, models, lighing engines, effects, ect.), and that makes up the biggest factor of how good a game will look. The difference between 900p upscaled & 1080p is negligable.
But a lot of people just like knowing that thier games will "run the best" or whatever as that helps them to justify thier purchase of one console over the other, especially when they are both so simular.







