I gave mine to my son. I figured that my son might want to use the touch screen I went with Gnome because it seemed a little more touch friendly. I told myself it doesn't matter because he is 8 and I can always reinstall.
I chose Debian (Stable) so I wouldn't have to deal with keeping it updated, put a root password to prevent them from going crazy with installing stuff.
I will have to put Scratch on it someday, for the moment he cares about the following:
- the LEGO website to look at instructions - the music player to listen to soundtracks from his favourite games - MyPaint for making drawings
He is starting to figure out the idea of folders, deleting things, undo, etc., but hasn't asked for any other software or even games yet.
I am a professor and would like for my son to learn about word processors, spreadsheets, programming, etc.. If he ever asks, I will give him the root password and let him browse the repos. Right now, I'm just happy to see him enjoy it without doing what lots of his friends do: sit in front of YouTube all afternoon.