Dallas ranks 15th in red zone offense, along with ranked 4th in overall ppg defense. They also sit 1st in scoring offense, and tops in passing offense. Passing offense is one of the areas that they excel, hanging 28 TDs through the air. Dak Prescott, who is averaging 269 passing yards per game just threw for 271 yards and 2 touchdowns against Philly. I expect much of the same here. There will be rain and a lot of wind expected by kickoff.
The Bills are 29th in rushing defense - and it won’t be easy for them to stop the steady running attack from Dallas. They give up 4.7 YPC to opponents. The Bills are more than good enough to make this interesting, but the completeness of Dallas +2 will be the reason that Dallas wins. 

MY PREDICTION: Dallas wins 27-20