I'd go with an iPad Mini for kids. There's far more tablet software available on iOS.
I have a Nexus 7, iPad and iPad 2. I don't know a lot of people that have a Nexus 7 and a Galaxy Tab 2.
4 x IG Prestige MP, 70 cm, 376 grams, 386 SW, ALU Power @54, Prince Syn Gut 16 @58