Re: your decision: You asked “which would be best for me”. But provided very little information about you. So I really have no clue.
I can offer some information regarding Cornell. I’m not sure it offers a “poli sci” major per se, actually. I think it has a “government” major. Cornell offers a wide variety of courses for someone interested in this general area: from courses in the Government department in CAS, Policy Studies in Hum Ec, Urban Planning in CAAP, and various courses in ILR. Suggest you might check out the course catalog in each of these areas and see whether their offerings may be appealing to you.
The suicide rate is actually not particularly high there. And some say being a “lower Ivy” is like having a “smaller mansion”. As if these strawmen should dictate your matriculation decision.
You can apply to law school, anyplace, from any undergraduate college. My D1 is reviewing some great law school offers right now. She attended college at someplace no more compelling than any of your choices.Given her results, and what I’ve read elsewhere, it doesn’t seem like the particular undergrad college really plays that much of a role in Law school admissions. Especially among places that are so similar, why would it? They will care first and foremost about your LSAT score, secondly your grades.