Your ultimate goal would be the best grades and MCAT score possible. If money is not an issue, I would recommend volunteering instead for the clinical experience. Kill two birds with one stone (clinical experience and volunteering) by working only 4 hours per week. Depending on what you do, you may have enough down time to get studying done. I have seen people bite off more than they can chew with entry-level clinical jobs, and this ultimately cost them medical school and much more (ended up under-employed).
With that said, if you are able to work and not negatively impact your grades, then scribing is the way to go. It will get you pretty good and doing the H&P, which sets up a good foundation going forward. When I was in medical school, however, they started us at step zero, so I never felt behind compared to peers that scribed and did other stuff. I currently work as a nocturnist, and noticed a lot of the emergency medicine physicians use scribes. I haven't had a chance to chat much with them, but can imagine working overnight shifts while in college doing the pre-med track might be quite difficult. For a gap year, scribing would be the way to go.
Also don't forget you still need to volunteer on top of any paid clinical experience. Hence why I recommend just doing something like volunteering in the emergency department instead.