But seriously, the only one who can answer that is you. I had a Kinect on the Xbox 360 and the novelty wore off after a month, then it was back to proper games again...
Get both TBH, I went with the PS4 first (only have it 4 months now) because of PS+ and there where more games I wanted to play on it.
I'm still getting a Xbone this year for the exclusives they have.
So I'm in the get both boat, play exclusives on both and get the multiform game on which one is the cheapest.
But seriously, the only one who can answer that is you. I had a Kinect on the Xbox 360 and the novelty wore off after a month, then it was back to proper games again...