Outside of the top tier defenses I would say its very hard to predict how well these defenses will fair for the rest of the season. No one gave the browns or the dolphins any credit, yet they have held their own. Two games is a small sample, so look at the next few weeks and reevaluate. The browns will face starting week 5 the ravens, chargers, bucs, steelers, chiefs, and then falcons before their bye. Thats just awful. Mia faces raiders (struggling), patriots (beat them last year end of the season), bengals (meh), bears (meh), lions (meh), texans (meh) and jets again. If you want another defense for a while i would take mia.