George, 

Honestly I would say it's the Denver Broncos. They lost to a good Buffalo team on the road. Broncos have the best defense in the NFL. Offensive Trevor Sieman is going to do just enough for them to win. They run the football well and have the best home field advantage in football. 

Also they still have a ton of guys that were on the Super Bowl 50 team. That huge because where there are other 3-1 teams like the LA Rams who are trying to prove themselves, Broncos already know what it takes to win and win big games.