Who makes more, Nurse Practitioners or Physician Assistants? Which one is more marketable?

Physician assistant makes more, but Nurse is more marketable in certain counties lacking a full nurse staff.
It all depends of the needs. Believe it or not, even a physician cannot perform the job of a nurse, because although a physician is highly skilled in medicine, he might not be skilled in how to properly care for a diseased person, how to convince him to take his medication, how to make him feel better etc. There is a lot of training with nurses that the doctors don't have.

Nurses are trained to interact with the patient, doctors are trained to understand the workings of the human body. Some doctors even have very poor social skills.

It all depends of the needs. Also, being a nurse is much more physical and demanding job and has a higher turnout ratio than doctors.

P.A makes more there both marketable there will always be a need for health care both are great professions.