I had both.
Bought a Wii U in November 2013. While it did have some great games that I enjoyed enormously like BOTW, Bayonetta 2, and Mario Kart 8, the droughts were absolutely brutal and really soured my overall feelings towards it.
Bought a 3DS in 2015; Monster Hunter Tri was one of my favourite games of the 7th gen so when MH4 came out only on 3DS, I decided to grab one for it. Big mistake. To this day it's the only gaming system I have ever regretted buying. Disliked it immensely and whenever I played on it I just couldn't help thinking "man, I'd be enjoying this so much more if it was on a console."
Still, it taught me a valuable lesson; never buy a system that doesn't excite you just cos it has a game or two that do.
Got a Switch in October 2017; I decided to wait a few months beyond the launch window, until Nintendo proved it wasn't another Wii U. So far I absolutely love it; if it can manage three more years as good as 2017/2019 it has a shot at dethroning the SNES as my favourite system of all time.
