Major doesn’t really matter according to the admissions people at my school. My class is definitely heavy on the sciences, but we also have engineering, english, arts, etc. Do what you’re interested in because chances are you’ll never study it again (unless it’s basic sciences). Plus, you’re more likely to do well is a major that you enjoy studying.
I have a BS in aero engineering, so 95% of stuff in med school has thus far been very new and foreign to me. Some people that majored/worked in specific areas have a leg up in some of the coursework, but in general school is a pretty good equalizer. It’s more about how well/efficiently you study versus what you learned in the past.