I say ask your 11 year old he probably knows exactly what he wants. I know that ruins the surprise but better to do that than get the wrong thing. My son has always been very particular in what game platforms he has wanted. We have a Wii (old now) and an old Playstation that bought used at the time. But there were games that only ran on the Playstation. Plus he has a DS. As a H.S. student he is mostly playing games on his PC.

It really depends on what types of games your kids want to play.