I grew up playing all their handheld stuff starting with a bit of GBC early on but mostly GBA. Games like pokemon gen 3, metroid fusion, zelda minish cap, kirby and the amazing mirror, and more were big for me.
I didn't actually have a console until the Wii, and that gave me access to gamecube games, so that kept me hooked.
For a few years in high school I stopped playing games very often, but decided to get a 3ds because it had a lot of games by then (it was 2015 I think). That kind of reeled me back in, but the switch is what really got me into following directs, forums, and the overall gaming community.
So, the answer to the question is that Nintendo games were all I played as a kid. That's probably why the 3ds was my first choice when I got back into gaming and why the switch appealed to me so much (and still does). Since then I've started playing other platforms, but for me nothing beats the hype of long awaited Nintendo games like Smash Ultimate, Breath of the Wild, or Metroid Dread, to name a few.