UMich is a much larger school than CW and thus produced more medical school apps than CW, 796 vs. 199. About 4 to 1, but UMich is big.
But the conventional wisdom is that a high GPA (and MCAT score) is crucial to medical school admissions. So, if it’s all about medical school, then I believe CW would be the better choice here. Like a lot of large prestigious public schools, such as UMich, Cal and UCLA as a few examples, achieving a high GPA will likely be much more difficult than compared to a smaller private school, like CW.
Also, med school is expensive. So, saving $70,000 for your UG degree would be prudent. Even being a UMich parent, go to CW.