It's such a boring obvious pick, but my choice is still Breath of the Wild. It was just way too good to try and go against the grain on. I wish it had more competition, maybe Mario Odyssey will give it a run for it's money, but the only game I've even had remotely as much fun as Breath of the Wild with is PlayerUnknown's Battlegrounds and I can't in good conscious give it Game of the Year since it's so unpolished and still in Early Access.
Though I will say my runner up is Resident Evil 7 specifically played in VR, I've taken every chance I can get to rant about it, but that game goes from great, to an incredible fresh experience when played in VR. Since this contest doesn't specify the VR version of the game, I'll probably still just go for Breath of the Wild.