My wife is a therapist and my brother is an attorney. I would say with all the science and anatomy courses the physical therapist is harder. They also seem to be more able to obtain jobs that pay commensurate with their years of education since so many law grads are underemployed even suing their law schools recently for understating the number of jobs in the market place. A lot of schools are limiting the number of master degree program spots inPT to keep demand up.
My friend's son is going for his PHD in PT and they use their University 's medical school in NYC for their gross anatomy lab work. That's why I know their anatomy studies are so comprehensive. They learn all the attachment and insertion points for all muscle groups and the nerve tracks just like the medical students.