Based on what we've seen so far, I have no doubt that Zelda will be anything less than good, but I'm not convinced it's going to be some amazing game.
On the other hand, we've seen literally no gameplay of Red Dead, combining that with the fact that I think Red Dead Redemption is an overrated game (though still great), I'm not convinced RDR 2 is going to be anything special either.
Having said that, I'm certain they'll be both be GOTY contenders next year. I would also throw in Persona 5 as a strong contender. Horizon as well. I would also mention Scalebound as a potential dark horse.