I have been using my ps4 extensively since the past 2 months now. The graphics are to die for. The machine is a beast. Even the new controller is a huge step up from the dual shock controller of ps3, its ergonomically designed and a lot more comfortable for extensive gaming. Lastly the exclusives such as KZSF and Infamous second son seal the deal.
If you love sports games, like FIFA, Ea sports and racing titles then go for Xbox one. They have more bonus contents(Only from EA) and I think the images are more sharper.
But I would personally give the edge for XBOX one because of Kinect. It is a marvellous piece of engineering.Man that is so awesome. It immerses you into gaming.