SMO will probably win more GOTY awards than BoTW for an even more simple reason: it is the newer game.
New games have it much easier to get GOTY awards than games with similar quality that are 6 - 10 months older. They get much more media attention in the weeks before the award decision and many award juries will be affected by that, at least unconcious.
That's partially the reason newer games get more awards.
There is also the fact that the longer a game has been out the more people's hype and initial excitement wears off and they can better critically examine the game. You know, better determine if it was over-rated, over-hyped, ect.
In this case. BotW is still seen as one of the best games of all time. There is no reveiwers remorse by giving it a 10 when they want it instead an 8 or 9.
It's the same reason I HATE seeing "best games of all time" list include games in the last year. They are too new. The verdict on them is still biased. I mean look at that same list the following year. Half those games won't be on the list anymore.