Well I now own both and agree with some points but disagree with others.
You can control the XMB easily enough with Move - it's intuitive unlike with Kinect which seems to be a bit of a hit/miss mixed bag. For example, last night I was sitting there and my son said "kinect", at that point I remembered it could do voice control so I tried a few things - seemed pretty good however there was an issue signing in. Firstly you can only 'sign in' using gestures (ie I had to stand up and select the user), why there is no audio control for that confuses me. Secondly I couldn't seem to change the 'master' sign-in. My son was signed in - but I couldn't sign in myself. It was 'stuck' on my sons sign-in.
There were also other issues. My son was sitting on the arm of the sofa just moving in a natural way as we were talking and for some reason he was affecting the on-screen selections (even tho I was trying to do things via voice). Other issues I've had are that it's not as accurate as I expected, playing dance central (and not even paying close attention) I noticed my daughter managed to get 'flawless' on a move she didn't really get that close to. It also has other issues with accuracy noticed when I put my hand on my head but the avatar had is hand behind the back of my head, my son scratched his backside and the hand (on screen) appeared to be in front of his avatar. This translates into the games, so when playing adventures you can see it's just not very accurate.
This has been compounded by a couple of 'game breakers' for me, I have had to cold reset around 3/4 times and I also noticed that even if you change user in-game the main sign-in get's all the gamerpoints (to my daughters frustration). This is made even more frustrating as when she played fully signed in it seemed she could not get the points again (for example she earned me the 'break-it-down' points and then seemed unable to earn them in her own game).
So it sounds really negative right? Well, I suppose so, but I have just spent a lot of money on this and I expected a lot better than a bit of an improvement on eyetoy, however I like to end on a positive - and that is Dance Central. Whilst it had some problems I have to say it is a great little game - and is a great example of what can be done...so fingers crossed for future titles. Also without any doubt in my mind - the kids loved it...and I guess that's what it's all about?
Fingers crossed the problems I've had are teething issues and will sort themselves out, I also need to try and borrow a copy of the sports game to try that out!
Does anyone know why Dance Central couldn't be done on eyetoy? I guess it would be harder to setup, but I would have thought it could be possible?