They're both challenges, and they're both learning experiences. Basically, in a game, you learn the controls, and then you find out about yourself (what playstyle you're most comfortable with), your opponents (their strengths and weaknesses), and your environments, and then you improve upon yourself and your skills, just like school and college.
In an RPG, your character gains experience points and levels up, and in a way, experience is what allows us in the world, and our characters in the world of the RPGs, to learn and grow. And I can tell you, building upon yourself and your skills can be a much greater reward than anything else in the world, even money and glory. And the best part is that there is no end to learning, because there is no such thing as perfect, but rather the strive to be better.
If I were to get a child, I'd have him/her turn video games into homework. I'd have him/her write a report on his/her playstyle, his/her opponents' playstyles, the levels/maps he/she involved himself/herself in, and how he/she can improve upon his/her playstyle. I know this'll sound strict and unfair, but in the end it'll be worth it, as it'll turn him/her into an expert problem solver.