When I decided to pursue a career in medicine a year and half ago, I was uncertain about PA vs MD, so I decided to apply to both. PA schools definitely have more prereqs. Look at UTMB or Baylor for reference. The main one is Anatomy and Physiology. I am SOOO glad I took 1 and 2. It helped me a lot for the MCAT. Plus, since I APed out of Bio, I needed 8 hours of Biololgy with lab (I didn't know that till recently). I took the MCAT July 30, and the GRE August 12. Of course, I received my GRE scores right after the test (Verbal: 650 and Quantitative: 790) , and I had to wait till a week ago for my MCAT scores (32R). Since my MCAT scores are competitive, I am now just applying to Baylor PA and no longer Galveston, which is an hour and 15 minutes from my home. I am more hopeful of getting into a medical school.
My advice is pursue both, even apply to both. Keep your options open.
It would be helpful if you take your MCAT and GRE well before you apply so you know what your chances are before you fill out all the applications.
Good luck!
ps. my undergrad gpa: 3.5 (BS: Physics, BA Astronomy, minor in Math)
Age: 28
Mother of a 2 year old.