should i do a post bacc or a master’s?

non traditional applicant looking to do a career switch! i’m in my mid 20s and a few years out of school. i’m missing quite a few pre-reqs and the pre-reqs i do have will likely expire by the time i apply.

my gpa is low, just a hair over 3.0 due to studying engineering at a competitive undergrad. would admissions look more favorably at a master’s or is a diy post bacc sufficient?