No doubt the Cornhuskers have the better looking offensive stats right now but at the same time the Canes started a 'true' freshman at a road venue to start the season... Now he has improved and as he improves throughout the season so will Duke's numbers. Louisville consistently stacked the box with 8-9 players Labor Day night and truthfully the numbers for the offense were horrible that night. As the offense opens up for Miami vertically it will force teams to no longer stack the box.
Now if I'm Nebraska, I stack the box on Kaaya and force him to throw downfield.
Regarding AA and Duke.. If you look at yards per carry... AA: 6.9 Duke: 6.4. These numbers are more comparable in Duke's case. Duke has run the ball 14 less times than AA.
I honestly have no idea which one of the two are better but I'm sure by the end of year we will definitely know.
We also have to look at level of competition
NU has played FAU, McNeese St and Fresno St
Miami has played L-Ville, FAMU and Arkansas St
Again, not really certain who has had the tougher road.
All this being said.. Nebraska has the better team at this point and in my opinion it's due to the lack of experience at QB. Kaaya may have the goods to be a 'good' college quarterback but he needs the reps to get there.