Proven depth Iowa has to have a huge edge at offensive line. Along with QB, the largest disparities when comparing the teams. I think Iowa also has an edge and defensive line and WR. Iowa has more proven players than ISU. Defensive backfield is a push, Iowa returns a bunch of players who have played well. So does ISU. ISU gets the edge at RB, but not by much. Iowa has more proven depth. ISU at LB. Iowa at special teams with a big edge. Especially at place kicker and the return game.
Edit to add, ISU is more proven at TE, sohave the edge. I wouldn’t, at this second, trade the TE rooms. Iowa has a bunch of talent. Just my opinion.