Since 360 is a higher number than 1, is it saying that the games run better on the older system?
The two systems have different physical architecture, operating systems, and about 8 years apart in technology. To use the older 360 games requires software patches and possibly emulating to get the games to work on Xbox one. So some games will work faster or slower depending on how they can use the the resources of the new system. The analogy is software programs made for windows 98 OS trying to work in windows 8 OS.