As for dates, both games in the U.S. release on the 25th. DC2 releases in Europe tomorrow (me = jealous) and KS2 will probably be the 28th, not positive on that last part though.
LOL, I thought this was going to be about picking Just Dance 3 or Dance Central 2. For that, I will have a review up for DC2 next week and an article comparing the two major dance games.
Comparing KS and DC is like apples and oranges. Both are good, but they are totally different. If you are looking more of a workout, I'm guessing Dance Central will keep you constantly moving. As far as I'm aware, there won't be a calorie challenge out with KSports when it launches, which means lots of pausing between events, even though the events look like they can be quite active.
KSports has more variety and may be more approachable by other family members or visitors to your house. However, there are several people that having dancing parties too.
KSports has a neat Facebook app (they are working to fix it after FB's recent update) and they have a way to send challenges to friends. DC will be picked up by a lot of people in this group and you will be able to see high scores and try to beat them. Both games will have leaderboards.
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