My biggest concern here is a letdown after what I assume was an emotional win last night, although Buffalo might be in a similar boat after that KC game.
On average I think we're the better team given the defensive injuries Buffalo has had and the volatile nature of Allen's play, but they can obviously beat us, especially at home and especially if we come out flat after last night.
Their defense is kind of similar to Philly's in that their pass rush is really good but their back 7 is pretty weak, especially with Milano, White and perhaps even Hyde out.
Offensively, contain Allen, hit him a few times and hope he goes into a Romo-esque funk where he just starts flinging the ball around into danger aimlessly. For as much love as his highlight plays get, it's that same reckless nature that leads to games where he turns it over 2-3 times, so the hope is to not let him kill you with his legs, get some pressure and hope he starts fucking around.