If you get a switch then don’t buy the physical games - buy them for download. The cartridges are small and easily misplaced by kids.
Smash Bros - $50+
Mario Kart - $50+
Mario Odyssey - $50+
Etc.
Buy a large mini sd card and download them. They’ll be tied to your Nintendo account, to boot, so if you misplace your sd card then you can download the game again.
Don’t ask me how I know!