You cant compare hardware to hardware to determine which is better. The xbox and ps have exclusive special built jaguar chips, and graphics also custom made. Plus the os and game coding are completely different.
You need to take end result and compare. End result is xbox 1 (as of this very moment) plays ultra settings at 50fps, ps4 plays ultra at 60fps. Both those are limited to 60fps. The xbox 'according to them' will be upping to 60fps soon.