Case. Period. (And I am a nursing instructor). Not a single employer will care you went to Case over UMich. And you will not get paid more because you went to UMich over Case.
You are 6 or 7 years away from even considering traveling and who knows what the need or salary will be for travelers by then. Social media shows travel nursing as glamorous but the reality of it can be much, much different. You may come to realize that your mental health and social life may come before your paycheck.