Games made by first party studios. Co- development will also counts.

Sony

Knack, The Playroom, Gravity Rush Remastered, Gravity Rush 2, The Tomorrow Children, Uncharted the Nathan Drake Collection, Uncharted 4, MLB 14, MLB 15, MLB 16, Kill Strain, Hohokum, The Order 1886, Everybody's Gone to the Rapture, Infamous Second Son, Killzone Shadow Fall, SingStar Ultimate Party,  Tearaway Unfolded, The Last of Us Remastered. Bound, Fat Princess Adventures, Unfinished Swan, Escape Plan, Journey, Flower, Flow Until Dawn, Beyond two souls, heavy rain , Alienation, Resogun, Super Stardust Ultra, Bloodborne

Microsoft

Halo The Master Chief Collection, Halo 5 Guardians, Rare Replay, Cobalt, Gears of War Ultimate Edition, Max the Curse of Brotherhood, Kinect Sports Rivals, Kalimba, Forza Horizon 2, Forza Horizon 3, Forza Motorsport 5, Forza Motorsport 6,

Nintendo

Animal Crossing Amiibo Festival, Captain Toad Treasure Tracker, Donkey Kong Tropical Freeze, Dr. Luigi, Game of Wario, Kirby and the Rainbow Curse, T he Legend of Zelda Twilight Princess HD, Mario Kart 8, Mario Party 10, Mario V Donkey Kong Tipping Stars, NES Remix, NES Remix 2, New Super Mario Bros U, Nintendo Land, Pikmin 3, Splatoon, Star Fox Zero, Star Fox Guard, Super Mario 3D World, Super Mario Maker,  Super Smash Bros, Yakuman Ho-Ho, Xenoblade Chronicles X, Zelda Wind Waker HD,

Nintendo. No contest.

Overall best library would go to Sony.

Nintendo

..because that IS their whole library

Even with how bad this generation has been for them Nintendo still takes it.

Nintendo by a country mile.

For all their numerous and egregious failings this generation, they still retained their position as one of the finest video game developers on the planet with titles like Mario Kart 8, Tropical Freeze, Xenoblade X, Splatoon, and Pikmin 3.

Because adding to the criteria changes the meaning of the thread.

Unless you just want to go grab a few drinks and aren't hungry

nice leaving out Bloodborne, Ratchet & Clank, Until Dawn, Infamous First Light, Driveclub, LiitleBigPlanet 3, The Last Of Us Remastered, God Of War 3 Remastered, Journey Collectors Edition, The Heavy Rain And Beyond Two Souls Collection and a lot of other japanese games, indie games and VR games

What curl said. I don't think there's been such a significant gap between Nintendo and the competition in terms of first-party output since the SNES era. It's due to two things: Nintendo and its partners maintaining their excellence and competing first-party studios regressing. If you added in 3DS it would be an absolute bloodbath.

Even if the question was first AND third party libraries, I'd argue Nintendo comes out on top. Most of the great games this gen have been homegrown Nintendo titles or "indie" games. WiiU and 3DS support most of them.

I take Gravity Rush and Bloodborne over anything Nintendo or MS has to be honest