Super Smash Bros is my fav.
It's kinda a weird case since the 4th installment was split between 3DS and Wii U.
Somewhat unrelated, but I wonder if the non-existance of the 3DS version would've helped Wii U sales significantly...
"Just for comparison Uncharted 4 was 20x bigger than Splatoon 2. This shows the huge difference between Sony's first-party games and Nintendo's first-party games."