I see these teams as pretty much even. Both very good in some positions and flawed in others. I would normally say Allen will be the difference, but that's assuming his receivers catch the balls he throws, which isn't a certainty, as Mahomes found out last week.
After the debacles against the Jets, Patriots, Jags, Giants, and Broncos, all games the Bills should have won, my confidence is shaky. Put it this way: I wouldn't be surprised if they lost big OR won big.
Weird season.