I would think it is offense for the same reasons ATLVols mentions. We were in the 3-4 for one year on defense, and while that was a disaster in itself, our lack of speed and ability have been evident against teams of higher caliber. We have had playmakers on offense. We just haven't put it together yet.
With all the coaching changes in the last few years. Who does it hurt more O or D? I would like to think it hurts the offense because of all the different plays and how each coach changes the names of the plays. Fire away VN
It really depends on what year and what coaching changes you are talking about. It's hard to argue that trying to play a 3-4 on defense all of a sudden, with players recruited to play in a 4-3, didn't have the most brutal effect over this down period.
The good news is that it should have little change this year with the whole staff being the same.
I would think trying to "unlearn" the Sunseri defense would be the hardest.