If you can justify how it'll make you a better physician in your personal statement, then go for it. Otherwise, med schools tend to like applicants that have some scope to their education. They love liberal arts majors as long as they can prove they're still good at the sciences and they do good on the MCAT. It would be better in my opinion to do average in bio and on the MCAT than to do great as a liberal arts major and bomb the mcat or do average in your pre-reqs. But if you do great in liberal arts and own the MCAt, that would be the best for admissions sake, probably. But will it make you a better doctor in the long run, or a better person?
*The above is just my opinion on what I think med schools like