Today has the potential to be one of the best games in recent memory. Two very high quality teams that deserve to be there, unlike some years where some team who was not very strong during the year goes on a hot streak at the right time, the playoffs, like Tennessee almost did.
KC is the flashier team who can put up points in a hurry, so they are never out of it (down 24 to Tennessee). SF just seems like a more well-rounded and physically strong team. They play kind of an old school game. Both teams are well coached with relatively young QBs, but there is more pressure on Mahomes to perform at a high level. Jim G just has to avoid fucking up.
I think it will come down to mistakes and which team can dominate the lines of scrimmage. Can the SF O-line allow the running backs to chew up yards and big chunks of time? Can the SF D-line pressure and contain Mahomes? I think the O-line has a better chance of doing their job, but if they fall behind then they will have to throw more, which I don't think is their first choice.