For me the sleek hardware and UI design is just so much more appealing than the Wii U. Pretty shallow I know. Also that one-two punch of Zelda and Mario during the first year was pretty convincing.
That’s actually my least favorite thing about it lol. The 3DS eShop music still super catchy and the thing has so much character. Switch is bland by comparison, and they still have a laggy OS in spite of that!