I am also biased…big UIUC fan. When my son was admitted to both schools, something that factored in his decision, which I didn’t see mentioned yet, was AP credit. We compared how much credit he would receive…and how it might factor in class load per semester, as well as the ability to take higher level classes earlier.
Also, since cost seems to be an issue, note the increase in tuition at Michigan when a student goes from lower (freshman/sophomore) to upper division (junior/senior).