My friend Charlotte would say Pokemon: Let's Go Eevee/Pikachu as it's a great standalone game and it links to your PokemonGo account and allows you to transfer critters from your Kanto 'Dex to your Switch. It also gives you a mystery gift box for your PoGo game.
PoGo itself is a great social game, with a community day every month to encourage people to get together to play and exercise. it's why I actually have friends.
We as a family love Mario Odyssey and DS has just got Mario Party which we will probably use more at Christmas when people come round as it has a lot of mini games you can play 4 player. DS also has minecraft and splatoon and for Christmas has asked for Super Smash Bros.