I think that they are both amazing schools so congratulations on having such a great choice!
In this instance, I am going to have to vote for Davis... When you factor in not only the the tuition difference as well as the cost of living difference, I just think that Davis can't be beat in this instance...
I currently live in Davis, and work for UC Davis, and my wife and I pay 1100 dollars for a 2 bed 1 bath apartment... We are moving to Georgetown next month and will be paying 1100 dollars for a studio...
Even if you'd rather live in DC (I would too personally), think long and hard about the cost difference!
Also, Davis is an awesome place, I'm not such a huge fan of Sacramento... For example though, last night my wife and I walked through Downtown Davis, there were college students milling around, and we ate Pluto's (a sandwich and salad place) out on the sidewalk listening to music and just hanging out, and it was like 80 degrees and perfect... Those are the kind of evenings I will miss when we move. You can't get experiences like that in DC, you get different, but perhaps equally, great experiences.
As far as the medical schools go, in my extremely naive opinion, it seems that they are both well respected and will get you to the same places... If you have any questions let me know!