For me, I'm gonna have to say the Wii U. The Wii U, even though it's not the best console, was something that actually kind of changed me.
The Wii, also one of my favorite consoles, was something that I was all over for a good while, and I still play from time to time each day, because of the Virtual Console games I have left over on it. The game that I enjoyed the MOST on the Wii, though, was Super Smash Bros. Brawl.
I was pretty big on Smash, so naturally, I wanted a Wii U immediately when Smash Bros. for Wii U was announced in E3 2013.
And when I got a Wii U in February 2014, quite a few months before Sm4sh came out, I was still all over it. It was all the tiny things about it that I loved. I loved its menu, I loved its Internet Browser, (a huge improvement over both the Wii's and the 3DS', and something that I've used for many, many hours) I even loved Miiverse, although it's gone down the drain these days.
Another thing that I did with my Wii U was play my old Wii games, which I was A LOT better at now that I was older (12 when I got my Wii U). I completed Super Mario Galaxy for the first time on a Wii U. I beat the Subspace Emissary for the maybe FOURTH time on a Wii U. I almost 100%-ed Sonic Colors on a Wii U. Many memories were made from old experiences with my Wii U.
I should also mention that I got Super Mario 3D World. I lost it in June 2014, but the small amount of time I had with it was one of my favorite Mario experiences. (Though, nothing can top Super Mario 64).
When I did finally get Super Smash Bros. for Wii U, my dream was accomplished, and the Wii U definitely became my 100% most-used console. I have played Smash Bros. for over a year, and the matches I've faced were some of the most intense things that I've experienced.
Sure, the PlayStation 4, the Nintendo 3DS, and all those other consoles may be more popular and have more games, but I'm fine right here with my Wii U. (I actually got a Nintendo 3DS XL in Christmas 2015, and I was quite underwhelmed.)