Physical Therapy/ massage therapist
I am a massage therapist working for the last 12 years. I started out independant, then shared an office with two other people. Then I decided to work for a chiropractor and a physical therapy office.
As you can see I have dabbled in all areas. By far the most respect and learning experience was at Physical Therapy. You work hard but you learn so much about anatomy, exercise, and range of motion through massage.
Financially at a medical office the pay is going to be less because the office holds all the liability. Looking back on my career the best way to have a great career in massage therapy is to work part-time in a medical office and also have a private client base. Now you have the best of both.