I was 100% going for xbox one, but from reading reviews, the ps4 seems well above the xbox in terms of power, display resolution etc!?
PS4 is more powerful on paper but it will all come down to how developers utilise the power. The 360 had a more powerful graphics chip than the PS4 but the games that have come out recently show that the PS3 is very much capable of challenging that, so this time with the One having a slightly weaker graphics chip may not make much difference, it will all come down to the developers.
As for resolution, Forza 5 has been said to run at 1080p at 60fps. Yes some 3rd party games have worse resolution right now but these are first wave games and the devs need to get to grips with the hardware.
I'll end up getting a PS4 at some point, I do own a PS3 along with my 360, but for release I'll be getting the One due to the release games and the fact that Xbox Live is a proven service, what Sony has said it is changing PSN into is not.