As somebody who was in Health Science for a year here at UOttawa, the only thing I would point out is how much it is NOT a science degree. You really aren't required to take any hard science courses, and a lot of the curricula is social science. The more medical related courses (anatomy, the first year microbiology) are shared with the nursing students mostly - they're fine, but not especially rigorous.
Obviously, how you feel about social science is personal, but even with a pretty heavy liberal arts background, I found a lot of the health sci specific courses to be pretty unscientific. Not always evidence based...
Certainly, a biomed degree would be better prep for the MCAT, easier to transfer from into another degree, and probably also have better non-MD job prospects. Also, it may be easier to get research experience in biomed, although a more pure science would be better still in this regard. I'm super super biased, but my take is that having a really rigorous university level background in science is incredibly invaluable -though I'm sure that others would say the same about sociology. I mean, they'd be wrong, but still...
If health administration, policy, and the sociology of health are legitimately interesting for you, go health sci; if proper science is more up your alley, go biomed (or even biochem, biopharm, etc.)