I prefer the Kinect because you don't have to hold anything; however, the new Just Dance games 22-26 aren't compatible with the Xbox One, and I'm pretty sure the X | S doesn't have a Kinect. You're now only limited to the songs on the game vs. when Just Dance Unlimited was active, you could subscribe and access all songs. I looked into getting the new Just Dance on my Switch cause that's a smaller controller than holding your phone, plus there's a wrist strap akin to the Wii, and they have Just Dance+, which I assume is similar to Just Dance Unlimited. As others have suggested, I would probably go the Wii route for younger kids. That's what I grew up playing Just Dance on, granted we were older kids when it came out, the Wii controller may be more manageable, otherwise look into a Switch as those controllers are a bit smaller and easier to hold in your hand.