I would bet the under, as I see this as a 6-7 win team. I would of course I hope that my bet would be a big loser.
Sean Lee and Bruce Carter have not proven to be 16 game players, and if they go down, the D will be in trouble. Ware, Ratliff, and Hatcher are all a year older and more suseptible to injuries - as we saw last year. NFL players don't get less injury prone and healthier as they age. Quite the opposite. There's not a lot of depth in the DL to overcome injuries either. And what about Safety? Church and Johnson? Maybe they'll be all-pros, but we've seen nothing to suggest that they will be. I am very worried about this defense.
And then let's get to the offense. AUstin won't be healthy for all 16, he never is, and age won't help that. No worries on Dez. Can Harris and another young WR step up? No clue. RB is the same. The OL is ostensibly upgrade with Frederick, but both gaurds were average to below average last year. So still a concern.
The only positions I'm not worried about is QB, TE and CB. That's not enough in the very, very tough NFC East and NFC as a whole. Can anyone say objectively that Dallas is better than NYG, WASH, NO, ATL, SEA, GB, SF? CHI, MINN, & STL could be better too.
Over 8.5 wins? I'd put my $$ on the under.