Madold - imho:-
physio is the most common, mainstream form of physical therapy - uses combination of approaches - massage, stretches, manipulation, exercises, sometimes ultrasound etc, depending on the skills and specialities of the practitioner.
McTimony Chiropractic is a more subtle, vibrational form of standard chiropractics, which addresses skeletal alignment using manipulation, and pressure,thumps etc in specific areas to 'realign' the bones.
EMRT - Equine Muscle Release Therapy is relatively new, and was developed from the human Bowen Technique. It uses gentle fingertip and palm pressure over specific areas of the body, and in specific sequences to trigger muscle relaxation and the body's own healing processes. Can address muscular and skeletal issues, as well as systemic infections and even conditions like colic (there are 2 horses at my local riding school who the vet was ready to shoot when I got there to treat them). Will show off my new link skills now.......EMRT website
All the above can be very effective when done by a good practitioner. I personally like EMRT best because it is so gentle and non-invasive. During our training (2 yr course) we work with ILPH rehab horses who would not tolerate inept thumping and banging! Horses are very sensitive and while some can cope with traditional approaches perfactly well, others do better with a gentler method.
Sometimes a combination of treatments works best. Sometimes our local McT practitioner and I will work together on a stubborn case - she aligns the skeleton and I release the soft tissue enough for it to stay there.
Sorry - didn't mean to get on my soapbox....