My daughter is a junior at Rice and her final two choices came down between Rice and Michigan. As you know, both are great schools and but very different culture-wise, size, and location/climate. It was a hard decision for her and she changed her mind daily. Luckily, I don’t think you can make a wrong choice. Maybe make a list of pros and cons of each and think about what you want out of the next few years. For my daughter Michigan was the safer choice - it’s closer to home and she would have been able to continue in a sport she’d be in for many years - but she ultimately decided the size and culture at Rice was a better fit for her (and she also wanted to get away from the cold winters). For her it was the right choice BUT I have no doubt she would have had a fabulous experience and education at Michigan. Let me know if you have any Rice specific questions that I can help with.
Congrats on having 2 strong options. Good luck to you!