First,
@lamusayonga congrats on your cycle and the great choices you have. Second, ignore anyone who tells you this is an "easy decision" or a "no-brainer." It is not.
Full disclosure, I'm a non-trad at Stanford Med. I turned down quite a few full COA packages (including from Michigan and a few other perennial 'top 10' school) to come here. So clearly I'm not big on the 'free/cheapest school is best school' received wisdom that prevails here. And before someone mentions the standard 'It's easy to say that when you haven't had to pay back the debt,' remember that non-trad part? Yeah, I'm quite experienced in paying back debt, thanks.
So, with that said... I love it here. I would make the same decision 95 times out of 100. This place is incredible, and every year I am more thankful than the last that I chose here.
That said, were I in your shoes, I would not come here. For me, I set a certain number, let's call it X, which was at the limit of me being comfortable taking on in debt. Below this number, I considered all schools to be equivalent cost, whether they cost 0 or X. That way, cost was out of the equation for schools with a COA X or less. For me to consider schools with a COA over X, there would have to be something particularly compelling to take on more debt than I was comfortable with.
$230,000 is well over X, for me. And Stanford is not so compelling over my other packages to make me take on that level of debt. Even though this place is just gobsmackingly amazing. Did I mention I love it here? I love it here. I would suggest figuring out your own X.
If X>230,000, come here. Seriously, you will not regret it.
Now,
if X<230,000, you have a really think about if Stanford is compelling enough, given your goals and the kind of life you want to live. If not, then this becomes Michigan vs. UNC. For me, Michigan is the clear winner in that H2H. But it sounds like you really feel good about being in North Carolina and not so great about the prospect of Michigan winters. (This is not trivial. Weather was a huge part of my choice, and being able to do outdoor sports year-round has gotten me through some tough times in med school) That said, Michigan seems to align more with your career goals than UNC. So perhaps the cold is worth it. Like I said at the beginning, not an easy decision.
Good luck!