Eraserhead, ultimately, Spitting Camel is right. You are what make you happy and successful.
Like I said, USC, UCI, UCD, and UCSD have the same tier matchlists. The only difference is that more medical student from each school will preferentially attend their own institution's residency (mostly because residency programs and medical students prefer each other). I want to emphasize that every medical school, anatomy course, USMLE, clerkship will be stressful and difficult. All pre-clerkship clinical experience or research is baloney unless you take years off to do it. I personally think it's bullcrap that on interview day you have to justify to the interviewer why you want to attend that school, because the difference won't be THAT much unless we are speaking East Coast vs West Coast or UCSF vs Univ Alabama.
Choosing medical school is like choosing undergrad. If a high school senior comes with the question, I am premed and choosing between UCI or UCSD, which should I pick? You'd say something like, UCSD is a bit more cutthroat, there is more biomed research there and more students there get into medical school, but ultimately it will depend on YOU to get into medical school. The same answer applies to picking medical school (except med school gives you less time to do research). Your success will be based mostly on YOU, not the school.
And yes, souljah is correct. If you want insight, ask 4th yrs, or heck, ask residents who attended those medical schools. Would the best advice for picking college come from freshman/sophomore, seniors, or students from professional schools? The higher up you go, the more wise the response you receive.