Hmm not sure tbh.
Even though Smash is my favorite series, that series alone would get bland really fast IMO.
I don't really have any synergy with any other game series tbh, like if Zelda ended up being the only game series, I'd probably just quit gaming altogether.
I guess just to be an ass, Call of Duty.
"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."