I won't be getting either, but here's how I see it. I gave my vote to the Xbox One because:
While it is more expensive, it does include Fifa 14 so there's more or less a €50 difference between the Xbox One (with Fifa) and the PS4 with no games bundled. Plus I get the Kinect for the Xbox which is normally €99. So all in all, it's not a bad deal at all.
Game servers. Microsoft specifically bought 300,000 servers for Xbox Live meaning Online gaming will be spectacular. CoD Ghosts with dedicated servers is great on PC and it's great to see it coming to consoles.
Exclusives. Titanfall is a Xbox and PC exclusive, same with Ryse and Forza, both of which look stunning. Forza Motorsport 5 looks superior to Driveclub.
DLC Priorities. CoD gets DLC first on Xbox Live, Fifa has exclusive content and BF4 releases it's first DLC on XBL first.
To be honest the only two gripes with Xbox are its' controller and its' looks. The PS4 looks better in every way. The controller does too, however the rumble triggers on the Xbox controller seem interesting.
Anyway, that's my two cents on the matter at hand. I'm just going to wait for all the PS4 fanboys to arrive and insult me for my choice.