For the Switch, it was Zelda BotW. I had a WiiU but wanted the definitive version. Ever since the N64 days, Zelda was the only Nintendo franchise I touched. Due to portability, Nintendo won me over and I found myself feeling like I was missing out being being pretty much an exclusive PS and PC gamer since the PS2 as I delve back into the exclusive games that Nintendo has to offer.
So in the past, I would have told you games, games, games. But after the Switch's portability offering me more ways to play and more playtime in general, I would say that while it is still mainly games, a console's unique features have a lot to do with it as well.