I fully expect TotK to be better than BotW in almost every conceivable way, from music to story to variety, but still get worse review scores (I mean, BotW is at 97 on Metacritic, so perhaps not the most ballsy prediction).
Still expect it around 93, but I just think some reviewers (and players for that matter) will have a tough time getting over the usage of the old Hyrule map and other returning (now less novel) elements, as well as some lamenting that it's not enough like classic Zelda games (even if it has more of those elements than BotW). I also think there will be some genuinely put off by the complexity of the building and fusing, and that what started as a novelty becomes tedious as that novelty fades.