It's so beautiful.

Overwatch 100%

He probably eats ketchup on steak.  How is he not perma'd?

Splatoon every day of the week.

Splatoon.

Splatoon is a fun game, but only on this Nintendo leaning site would Splatoon be considered a better game. Overwatch by the majority of people would be considered the better game and it makes sense. It's a more complex game made by people who have been making competitive games for decades.

I like them both...equally!

Splatoon. I've put over 400 hours into that game.

Overwatch feels so sluggish and boring. It takes FOREVER to get from the spawn point back to wherever the action is. And every map seems like one long corridor so it makes it take even longer. I wanna be where the action is, fighting and shooting, not spending 30 seconds running every time I die. In Splatoon you can jump to your teammates if you want, OR, in Turf War, you can always ink stuff along the way to wherever you're going, so it always feels like you're being productive.

I haven't played overwatch, so Splatoon wins by default. I've got to say though, Overwatch by all accounts is fun to play, but it bores me to tears to watch it.
Unlike Splatoon it's really not a good game for spectators.

Titanfall 2!

But between those in the OP: Overwatch

Game is just so gorgeous(Blizzard out-Nintendoed Nintendo) and is also fun to play with so many unique characters and abilities.