Yes, I'd say Tenn (best record in AFC) which came down to the wire. Also KC, and I don't care to hear the "KC was playing bad, blah blah". KC is still a very good and dangerous team on offense.
And not much difference in Pats opponents and Bills opponents. TB, Saints, and cowboys were the toughest ones on paper. Bills with Pitt, KC, and Tenn. So that's 3 teams each both Pats and Bills played that one could consider "tough games"