I went to a small private school for undergrad. I had an awesome therapist there but there wasn't a pdoc. I also had to deal with a HUGE amount of stigma (it was a Christian college with very conservative Christians. I'm a Christian but this was beyond reason).

I went to a huge state school for grad school. There I had a decent pdoc and crappy therapists.

At my undergrad accomodations were hard to come by. Even rescheduling a test was really hard once. In grad school it was a bit easier but required a neuropsych eval (I didn't need accomodations at that point).

My mom was a professor at a small college and there was not nearly enough support for students with mental illness at her college. She wound up in some difficult positions.

So it's hard to tell what you'll get.