Haven't finished the game yet, so this is just a precursory assessment, but at this moment it's definitely a tie between this game and Breath of the Wild. It's hard to compare the two, because Breath of the Wild accomplishes what it sets out to do so well, but it is a very flawed game. Meanwhile, God of War doesn't do that much that's novel (whereas BotW is Portal Skyrim, God of War is a cross between The Last of Us, Dark Souls, and Witcher), it's also functionally a perfect game. At first I thought the combat was a bit too simplistic, but then the game started to incorporate runic attacks and a VERY in-depth leveling system, and I was sold.
Basically, it's hard to say which is the best, but the two games are so far ahead of every other great and near great game this generation that it doesn't really matter.
Edit: I should say that I say this as someone who has repeatedly thought both Zelda and God of War were incredibly overrated franchises in the past.
