PS4 is more powerful, I still believe it will always have the advantage in graphics/res no matter how minimal some people think it is.

XB1 looks to have a better UI and camera features imo

Does the extra £80-£100 matter to some people for a lesser specc'ed machine.

If your friends have the XB1 and you play online etc then it would make sense to go for that, however it it's just a choice of getting one of the new consoles and you don't want any particular exclusives of the XB1 then it's an easy decision it has to be the PS4