Both schools are well respected. @ucbalumnus has the details on all of this, but I believe Illinois is a direct admit to major where as Minnesota requires a certain GPA to get your major of choice. Changing majors might be harder at Illinois as they don’t have excess capacity to move students around.
Before you consider any of that though, you need to consider the impact of the financial difference. What is the price difference and how will you cover it? Will you need loans?