Wii currently, though Switch has a very good chance of overtaking it.
My 2 favorite Mario games in the Galaxy series.
My 3rd and 1st favorite Zelda games in Twilight Princess and Skyward Sword.
My favorite Metroid in Prime 3 plus the trilogy.
The best version of Resident Evil 4 to this day.
Xenoblade and Last Story.
I still enjoy picking up Wii Sports and Wii Sports Resort.
Brawl was my favorite Smash game until Ultimate.
Red Steel 2
DKCR, the Kirby games, and NSMBW.
What I consider the best versions of certain 3rd party games like Ghostbusters, Force Unleashed 1, and Harry Potter and the Order of the Phoenix.
The last few Tiger Woods and the first 3 Madden games on the system are the best those series have ever been for me.
Resident Evil, House of the Dead, Dead Space rail shooters.