my kids have both...they don't play with either one.
Just get them an Android based tablet and be done with it. Tons of free games and stuff and it gets them used to a real pc...they have them in my sons Pre-K class at school...so they just don't want anything to do with the other stuff after using the real deal.
Super Collector - Looking for anything of Ahmad Bradshaw!-
See my collection at: Bradshaw44.com