Here's some gaming mathematics:
XBO & PS4 > WiiU
XBO = PS4
XBO + Halo > PS4
XBO + Halo = PS4 + Planetside 2
XBO + Halo + Titanfall > PS4 + Planetside 2 + Blacklight: Retribution + Killzone
XBO + Dead Rising 3 > PS4 + inFamous: Second Son
Battlefield 4 early DLC + CoD: Ghosts early DLC = Destiny early content
XBL > PSN
XBO = 3 points ahead
Wondering why I used Planetside 2 and Blacklight: Retribution as comparisons? Even though they're free games, which is nice, they both include a heap of microtransactions. They both also contain similar elements to Halo Xbox One and Titanfall. However, Halo and Titanfall are outstanding full-priced games. Killzone: Shadow Fall is very mediocre. Although it has nice graphics, the gameplay is very stale and too similar to other games. This evens out with Ryse: Son of Rome's disappointment. Both only really show off the console's graphics capabilities, rather than have unique gameplay. By observing the two, you can see that the graphics are pretty even, so don't fall for the whole 'Playstation 4 has way better graphics than Xbox One'.
The maths is based solely on my opinion, but I'm sure you see the logic behind it. For only $100 more (or $20 in Australia), you get a better camera, a better online service and better exclusive games - at least until the end of next year.