Hmm. I don’t know what he likes, but speaking for what I’d like, handing a valuable videogame system to a six year old, lol, I think the Lite’s unibody design is possibly more suited to taking typical abuse, drops, accidents, tempers, etc., from children.
I don’t know though. Does he seem like he’d like to play more on the TV and such? Or does he have siblings to play with, or friends that he likes to game with? Because the TV and single-system multiplayer capability of the regular Switch would be a much better choice in that case.