Xbox One Pros:
+ Extremely fast switching between tasks (TV, movies, skype, etc.)
+ Kinect seems much improved with 1080p quality and more accurate tracking
+ Controller seems mostly the same except with improved d-pad
+ Compatible with Smartglass
+ Kinect voice commands (useful for when you're holding something, such as food)
+ Wi-Fi direct
+ You and 10 family members can access your games library from any Xbox
+ Skype integration
Xbox One Cons:
- Significantly less powerful than PS4 console
- No Backwards compatibility
- Most likely going to have to pay to play online
- Got to pay for Gold to access media apps and multiplayer
- Kinect doesn't ever actually turn off
PS4
Pros:
+ Great new controller.
+ Improved UI over the PS3's.
+ Exciting slate of games announced for the year,
+ $100 cheaper than xbox one.
+ Camera is optional, and only $60.
+ Playstation Plus is a great value despite what some PS3 owners might gripe about.
+ Small and quiet.
+ Replaceable non-proprietary harddrives.
+ 50% more powerful graphics card then the Xbox one's
Cons:
- Sony needs to continue working on the UI and updating it over time so as to keep it streamlined.
- The light bar on the controller can't be turned off. Maybe a future system update will offer this option.
- Use of the trackpad seems gimmicky in most game so far.
- No DLNA or MP3 support
- No backwards compatibility
- You have to pay for PS Plus to use multiplayer