The difference between the 360 Kinect and the XB1 Kinect is thisone was optional, one was (initially) forced.
And not only that, but when the 360 version was released, not only was it optional, but it had quite the line-up of games either at launch or soon-to-be-released. So it actually had value. I bought one and played the heck out of it for months. Dance Central, Fruit Ninja, Child of Eden, Gunstringer, fitness games... it was great.
The XB1 version had... I don't even remember... Figher Within and the promise of Fantasia and Dance Central Spotlight. Oh, and a Fitness app that would eventually become a paid app after the free trial wore off. And nothing else on the horizon. It made the console $100 more expensive than their rival and had no gaming value outside of voice commands, which also had mixed results.
Even I, who bought the 360 Kinect, did NOT want to be forced into buying the XB1 Kinect until more games were revealed. Sorry... DC:S and Fitness were not worth the extra $100 early entrant fee.
What were we talking about again?
Oh, yeah. Javin's bedtime.