In fact, it depends from what he prefers and in fact it's hard to say who would enjoy what.. My SO plays all the time on her phone, I did wanted her to get in console gaming, bought her NDS, she has similiar/same games on it, but can't force to play on them.. I personally have few Sony, few MS & BigN products, all of them has down and upsides.. Personally, I would check his wishlists, but.. tbh.. If you're not sure.. Give him funds or buy it "for him".. That's what I would suggest. On other hand if he has Xbox already, he has games library, so new device won't be equal with investment big amount in games, and if he plays any "progress to gain" titles, he won't loose it. And only on that base I will vote for Xbox Series S