With the PS4 vs Xbox One, I ended up going with the PS4 because:
It's 100 dollars cheaper. The hardware's more powerful... and I thought it would have more games in the long run.
I thought that the PS4 actually had a significant advantage on media features (you can use more headset types, the browser is 5x faster and can be used with Plex), but it wasn't a major deciding factor for me, since I have other devices to use for that sort of thing.
I might buy an Xbox One eventually, but so far MS has been letting me know that I shouldn't. Forcing me to buy a Kinect isn't going to fly (I HATE motion controls, I HATE them), and Microtransations on Killer Instinct, Ryse, and Forza, has diminished my trust in MS's pricing models... So... I'm actually leaning towards skipping the Xbox One entirely. I can live without Halo, Bungie went multi-platform anyway.