I’m surprised there isn’t a clear preference either. How do you feel about the theology and philosophy requirements at ND? The strong focus on service/mission? Being undecided on a major doesn’t matter at ND because you don’t declare a major until second semester sophomore year so plenty of time to test out classes and see what you like.
We have a family member starting at Columbia. Absolutely wanted urban campus, lots of diversity, and the core.
I agree that the academics and preparedness for grad school is comparable.