I don't see the Bills defense slowing down the Bengals offense. Burrows gets the ball off very fast and hits the soft spots in the zones very well, negating the Bills' strength, its pass rush, and exploiting its weakness, especially Dodson (when he's on the field), Jackson, and Taron, who has been uneven this year. They also can run the ball with Mosert, and it seems the Bills always give up at least two big runs a game.
I have more hope on the other side of the ball. Their DC is impressive and worries me, but if Allen is on, he's allowed to run, and his receivers show up, this could be a very entertaining shoot out. Bills win in this case because Allen has more moxie, heart and sheer godliness than Burrow.