Wii Party U in my opinion. I think the many different ways it's used for minigames, for determining your dice role, for the tabletop games, for the drawing game, etc., are really creative and surprisingly fun. Personally, I haven't found the gamepad to be that useful for "regular" games where it's often just used for the map or inventory. Unlike the DS/3DS, it's difficult to look at the gamepad while focusing on the TV as they aren't in the same field of view. I tend to play most games with my Wii U Pro Controller and leave the gamepad on the sidelines. But games like Wii Party U and Nintendo Land have used it well in my opinion. For me, it has been at its best when used for local multiplayer purposes. The 3 "tag" minigames in Nintendo Land (Animal Crossing: Sweet Day, Mario Chase, and Luigi's Ghost Mansion) are still the most fun I've had with the controller, 2 full years later.
Upcoming Games To Get
Definite: Kirby Star Allies (Switch), Mario Tennis Aces (Switch), Fire Emblem (Switch), Yoshi (Switch), Pokemon (Switch), Kingdom Hearts 3 (PS4), Monster Hunter World (PS4)
Considering: Fe (Switch), Donkey Kong Country Tropical Freeze (Switch), The World Ends With You (Switch), Ys VIII (Switch), Street Fighter V: Arcade Edition (PS4), Kingdom Hearts 2.8 Remix (PS4), The Last Guardian (PS4), Shadow of the Colossus HD (PS4), Anthem (PS4), Shenmue 3 (PS4), WiLD (PS4)
