Apples and oranges, friend. They're both GOTY material for me, I can't see Mass Effect Andromeda, Danganronpa V3 or Zelda topping them, however Persona 5 will be tough competition. I'm loving what I'm playing of NieR: Automata so far, soaking in this atmosphere and doing the side quests which are all written so eloquently with fun gameplay, intriguing story beats and beautiful music to back it all up.
It's actually hard to say which has better side quests out of Yakuza 5 and NieR: Automata, they're both so good in this regard for me. Same goes for music but in different ways (Yakuza 0 having some of the most hype inducing music I've heard in a game, NieR: Automata having some of the most beautifully put together tunes since the original NieR). Both excellent games regardless.