Arkansas, for two reasons: (a) They will completely load up the box defensively, at the expense of their secondary. This was the blueprint they used last season, and is actually the blueprint I've seen them use for quite a few of their opponents. Could be part of the reason that their secondary is so awful. And if you'll recall, other than Trent Richardson's long, ludicrous touchdown scamper in which he broke at least 6-7 tackles, we really didn't have a whole lot of success running on Arkansas last season. That one play accounted for a good chunk of our rushing total that day. Conversely, we threw for about 290 yards.
(b) Arkansas will score some points on our defense. I'll be shocked if they don't. Those missed tackles and plays out of position haven't really hurt us so far, but they will against the Hogs. We'll be in a tighter game that we've grown accustomed to recently, and we'll have to chunk the ball around to put some points on the board and help the defense out.
I think our staff will have our team well-prepared, and I still very much like our chances against Arkansas. But we'll need a big day from Greg, Julio, Darius, Marquis, etc.