I don't think you can go wrong with any of the 3. Xbox and ps4 are a coin toss. Littlebigplanet would be a good one for a 6 year old which is a ps4 exclusive
I'd recommend the Wii U, it would be perfect for a 6 year old. It's too bad its nearly done but its got a lot of great games for all ages, including the e-shop with tons of older nintendo games
Minecraft is probably a game your son will love, its luckily on every platform
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