As long as we don't hire and fire on any one play or one game, I would prefer an offensive guy, but coordinators mean a lot.
There are obviously a ton of examples good and bad for both. Saban and Strong on the defensive side had completely different success. Helfridge and Kiffin were horrible head coaches, but Meyers and Dabo seem to be doing fine. Ultimately, I think a HC is more about motivation, vision, and influence, less about X's and O's, that's a coordinators job.
This might be an interesting conversation in 2 years after we see how Mason, Muschamp and Smart perform over the long term in the SEC east.