For that age I don't feel the consol mather really. Do there friend games? If that case maybe buy same consol as they have. Do you know what they want? I would say maybe discuss with them about friends consol, what they want and so on.
Otherwise I would say xbox is good with the gamepass if you wana pay for that. So many games and the kids can try and error alot pretty much. Thats what my kids done from time to time.
I personal don't like the playstation more one the adult side in one way on the games. But ofc there is kidsgame on that.
Then just thinking if you want them to be able to buy there own games in store, in that case get a xbox with cd, well same on playstation now to.
I have both consols and my kids preffer the xbox because gamepass but we have playstation for the exklusive really. Never had any bigger problem with any consolbrand. They work as intended even with kids handling them. We play nintendo for there games and familygames really.
But most games Sony have allowed that now. They don't like it but most games is crossplay nowdays.