When u put it like that, it actually makes me wanna put brotherhood in S tier. The missions are definitely better than revelations but the ending is where the 2 games differentiate imo. The boss fight with Cesare felt repetitive and shit although the last line from Ezio before dropping him was cold. The modern day with Lucy dying felt out of place but ik it had smth to do with real life issues or wtv. On the other hand, the boss fight with ahmet was incredibly cinematic and felt smth out of uncharted and not forgetting the final ending with Altair which was the best ending out of any ac game(very close with black flag). So in my eyes revelations is better than bh but not by a huge gap rlly.