I keep thinking Michigan is the best of those 4 but they don’t actually have a win to back it up. They’ve earned their reputation by playing UConn (and later Vandy) closely but both were still losses.
Ohio State probably has the best overall win (TCU) and beat Maryland. Played UCLA competitively also.
Iowa has good wins (Baylor, Michigan State, Maryland).
MSU beat Ole Miss handily and took down Nebraska and Washington.
Honestly Michigan probably has the weakest true resume at this point but I like their ceiling the most.