Transferring to another school is a bad idea for a couple of reasons. First, some of your courses will NOT transfer for credit. Sometimes the lack of transferability (I made this word up--you like it?) borders on the absurd: when I transferred to UT Austin, my upper-division biology courses transferred for credit, but my freshman biology coursework did not. Makes perfect sense, doesn't it? In many cases, transfer students have to log an additional year just to take the classes that failed to transfer. An extra year means more money out of your pocket and one less year of income as a physician (which might translate into $200,000+ of lost income). Second, you may transfer to a school where you don't know anybody. The solitude can really suck ass.
My best advice is for you to take the shortest possible route to graduation day. Whichever major will enable you to graduate faster is the wise choice. Remember: if you feel like you need to broaden your educational horizon, you can always take more electives. Since you have a lot of science courses under your belt, your best bet is most likely the biology degree; there's probably a significant degree of overlap, in terms of classes, between the clinical science and basic biology degrees. There's another possibility: does your school allow students to create their own majors? If so, that would be a great option for you.
