I cannot pick just one.
Wii U has Bayonetta 2, Wonderful 101, Xenoblade X and Tokyo Mirage Sessions #FE and Botw.
PS4 has Yakuza 0, Nier Automata, Astebreed on disc, Assault Suit Leynos, Odin Sphere HD, Persona 5, Wonder Boy and more. I like PS4 more than Wii U but they both have some of my favorite games in years.