Quoted from SantaEatsCheese:If your kids are 10 or under go with a Nintendo Switch. Mario Party, Mario Kart, Zelda Breath of the Wild, Mario Odyssey.
If your kids are 11 or older go with a XBOX One or PS4. Both systems have monthly subscription services available for a fee (pay monthly and get access to 200-300 games) or you can just buy games and play them as much as you want. Those systems also have the ability to pay for older system games.
If your kids are any age, buy them the system that has the games they want to play. The idea that Nintendo games are only for kids and Xbox and PlayStation games are only for teens and adults is ridiculous. All the Switch games you mentioned are fantastic for everyone (Well, except maybe Super Mario Party, I was really disappointed by that game), kids through adults, and the other systems have tons of games that are the same way.
Quoted from RyanStl:The console converting to handheld means nothing to me because the kids all have tablets anyway if they want portable gaming. I would like to get back to Playstation or maybe try an Xbox. I have no loyalty to either.
Definitely something to consider, but it's important to note that you won't find nearly as many quality games on tablets as you will on a portable console.