Zelda in my opinion, it has the pedigree, which, say what you will, it matters, and I honestly think the freedom the climbing mechanic gives the player will weigh heavily in its favor.
Zelda. Lack luster story (I like the story but i felt they could have done a lot more with it) but it's a well polished game that only surfaces every few years.
Zelda, unless Mario Odyssey gets nominated, then it's not going to be a guarantee. Mario Odyssey COULD top Zelda; I understand not EVERYONE loves Breath of the Wild.