Picking a college is a hard choice. I had a really hard time trying to decide when I was a freshman in college, where to go.
Are you a freshman? If so, and you pick a college and decide you don't like it after your first year, it would be pretty easy to transfer to another school.
Have you tried making a pros and cons list of both schools, and seeing which one comes out on top?
Has your bipolar disorder been effectively managed with the treatments you are receiving now? Most colleges have resources available to help students who struggle with mental illness. Even if you are far away from home, you should have access to psychiatrists and counselors on campus.
Also, an hour and a half isn't really that far away - if there was an emergency or serious situation, you would still be able to go home relatively easy, as opposed to if you were across the country somewhere or something.
I can't tell you which school to go to. I had a number of choices of schools as a college freshman. Rather than going to my dream school, I went to a community college near my home for my first two years. Then after that, I transferred to the school I really wanted to go to. Obviously, I would have liked to go to my dream school for all four years, but by compromising with myself, I was able to save a lot of money and at least get to go to my dream school for part of my education. I loved every second of being at my dream school, even though it was far from home.
Good luck deciding.