Nintendo Switch is a very fun system! Wish I had one, I actually don't. haha. I get my Nintendo fix on my 2DS.
My all time favorite would be hard to choose, but I would have to say that there are a couple of games that made me fall in love more with video games and that they had the most influence:
Counter Strike 1.6 & Source
Super Mario Bros 3
Grand Theft Auto 3
Zelda: Ocarina of Time
:)