I gotta disagree here. Baltimore once had an elite defense but they have been slipping. They are nowhere near the dominating defense from a few years ago. This Bills defense stunk it up against the Jets week 1 granted, but since have not only stuffed the run and generated sacks. They have also produced some turnovers. They've gotten better each week and they are just getting warmed up. At home against the Patriots, they will be bringing some heat.
I think the Bills D is better than the Ravens D.