Even though PS4 has better specs, and will be getting an hour of exclusive content, the Xbox one might be the best version of the game. Watch_Dogs producer Dominic Guay has said that the Xbox one version of the game will have a more more dynamic world compared to the versions on other platforms:
http://www.gamingtarget.com/article.php?artid=13270
He was comparing XBO's version to consoles of this gen = 360/PS3
UbiSoft has shown the game by using the DS4, and this is all about the PS4
Maybe this is why the PS4 version is the one they want to show off - http://www.digitalspy.com/gaming/ne...hed-further-on-ps4-easier-to-develop-for.html