In terms of pure GPU horsepower, the XBOX runs circles around the PS4 pro. However do make a choice based on what games you play as PS4 has quite a few exclusive games that do not appear on Microsoft's console. The difference between the PS4 and PS4 pro is not that significant as the difference between the Xbox one and Xbox one x. The former barely runs at sub 900p resolutions while the latter runs perfectly well at 2160p on most titles.
PS4 pro for the exclusives!
Although I would like to make a case for PS4 if you have a full HD TV. Being in the same generation, I don't think there will ever be a game which won't run on PS4 and on the Pro. And there are only a handful of games which really takes advantage of the extra muscle of the Pro.