This is a tough one. This might be a bit tougher without knowing the names of the two schools, although it can also be tough when you are the one who is deciding what to do with your life.
At some level we all do the best we can when faced with these choices, even though we cannot know how it will come out in the end.
I have noticed in your other threads that you were interested in medical school a year ago. I am also guessing that by “combined degree program” that you are talking about a BS/MD program. The fact that you even got accepted to this suggests to me that you have a significant amount of medical shadowing experience. All of this suggests that there may a pretty good chance that you will stick with medical school as a goal.
I will note that the majority of students who start medical school thinking “premed” end up doing something else. However, starting off in a BS/MD program does not preclude this.
$140k undergrad is not that bad for a bachelor’s degree. This plus $320k for medical school, plus inflation, minus $400k that you have available might leave you with $100,000 or a bit less in debt. This is a lot of debt, but is significantly lower than average for someone getting an MD. It will take you a while to pay this off, but if we assume that you get through medical school you should be able to pay this off more quickly than is average for all MDs.
Getting an MD with no debt is quite a luxury.
I may worry about this less than most people would. One issue might just be that the people I know well (including my immediate family and a sibling) all got into the graduate program that made sense for us, including some highly ranked programs. For several of us this did seem like some luck was involved (three of us only had one acceptance, but to very good programs that really were the right one for each of us). My understanding is that BS/MD programs do require maintaining some minimum GPA, so it is not really guaranteed (if I am understanding this correctly). Thus I am inclined to think that if you are meant to get to medical school and become an MD or DO then you are likely to get there either way. I am wondering whether I should be more worried about this (or at least worried on your behalf). I do recall one daughter having a good friend who was premed with very good grades who was having trouble getting accepted to any MD program (first time through this friend had no acceptances), so I think that this might be a valid issue.
Gap years before getting into medical school, or into any graduate program, are relatively common.
I could go either way on this. You might want to make a list of pros and cons both ways, think about this a bit, then take a few days off and not think about it at all. Then go with your gut.
Frankly both choices to me look better than average for a high school senior who is thinking “premed”. It sounds like you have earned these two very good opportunities.
And I think that you are very wise to avoid the more expensive alternatives that you have already ruled out.