I hear PS4 outsold Xbox One by a mile but it's strange because I only know people who either have the Xbox One or both. I don't know anyone who has just a PS4.
I know it's a small sample size, and not representative it's just a interesting.
I personally have both, and I prefer the Xbox One. We actually have two so I can game with my wife. The UI feels less like a toy, setting up groups and games is still much easier with Xbox Live than anything PlayStation has ever offered.