Iowa has been fortunate that both worked out real well and I do not have a favorite, but please be fair to those that may hold HF in too high of a regard according to your eyes...Keep in mind that when HF came on campus, Iowa had not had a winning season in 19 years. 3 years later we were in the Rose Bowl. That is common knowledge. What is not often remembered (or known) is that for any football team in the Big Ten, it was Rose Bowl or nothing until 1976. ANY bowl game, for ANY big ten team other than OSU or Michigan, was off the charts rare. HF's arrival was an abrupt shift that is hard to fathom today.
Side note: I don't recall a quick kick on 3rd down being all that exotic back in the day. I could be wrong. HF did not, however, punt on first down.. That was a Steve Martin move (too obscure, I know).
Part of my point is that it can be fun, and I will never stop entering such discussions, but it is impossible to compare the different worlds. One recent example: I was just watching a 1977 replay of ISU-Iowa game and the announcers were wondering out loud if ISU was going to risk a pass near own 30 on 3rd and 5. That also may have been a function of the announcers, but it was a frequent mindset of the day. (They did try and it failed.)