As @WayOutWestMom has correctly pointed out, the very large majority of students who start university thinking “premed” end up doing something else. Some cannot keep up a “medical school worthy” GPA in the tough premed classes. However some students, including some students who maintain very high GPAs in tough premed classes, just decide that they want to do something else. You will be exposed to a lot of opportunities in university, and may very well find other opportunities that are right for you.
One big question therefore is: Which of these schools, and which of the possible majors that you have been accepted into, would provide the most likely “plan B”? Of course all of the schools that you have listed are very good for many different majors, which might make this a difficult question to answer.
Another issue is that if you do stick with medical school as the goal, 8 years of university are very expensive. You do not want to borrow the cost of medical school as debt, and it is not completely clear whether it will be possible for you to borrow the full cost of medical school. As such keeping some college money in the bank or 529 plan is a good idea if you want to keep alive the option of ever making it to medical school. To keep medical school open as an option you should budget for 8 years of university. If you decided to do something else, the money you save may still turn out to be useful. As another answer has already suggested a master’s degree is for example a possibility for multiple possible “plan B” options, and master’s degrees are usually not funded.
I have consistently heard that students in very good MD and DO programs come from “all over the place” (an exact quote from a doctor I know). One daughter who took a slightly different path and is now a veterinarian has said the same thing. The other students in her DVM program came from a huge range of undergraduate colleges and universities. Our other daughter who is studying for a biomedical-related PhD has said the same thing. I can see where other students in her program got their bachelor’s degree and again it is all over the place.
And students are likely to do better when attending a university that is a good fit for them. Of course what is a good fit for you and what was once a good fit for me are likely to be two completely different things. This leads to the question: Have you been able to visit at least a few of your top choice schools?
The good news is that you are comparing 9 very good universities. Congratulations on getting this very good list of acceptances!
It is also not completely unheard of for a student to get into a research lab, discover that they love it, and not want to leave. I think that it is good to get some research experience partly to find out whether or not this is right for you.
I would take the cost of attendance into consideration unless your family can support the full cost of your bachelor’s degree plus another at least $400,000 for medical school without taking on much debt. I would at least try to keep the total debt for all 8 years down to $200,000 if possible, and if not then try to save money now in picking an undergraduate school rather than hope to save money by picking an affordable medical school – getting any medical school acceptance at all is difficult enough.
Unfortunately we are not telling you which of these very good universities to attend. Hopefully we are giving you something to think about.