Typically their training is about 7 years after a Bachleor's Degree, and most of it is in either understanding human behavior, cognitions, beliefs, etc. As such they are typically the most thoroghly trained in psychotherapy. They are also the only profession trained to adminsiter psychological tests. Licensed Clinical Social Workers are often as well or better trained in psychotherapy than most psychiatrists. Social workers are also often the least expensive, and are the therapists that HMO's rely most heavily on for that reason.
Psychoanalysis is the most expensive and time consuming brand of psychotherapy.
Originally pioneered by Sigmond Freud, psychoanalysis still uses a couch, and you are asked to freely say whatever comes to your mind. The analyst helps you make sense of things, including your unconscious, and uses the relationship you develop with them to understand your issues in depth. Behavior modification, in contrast, does not care at all what goes on inside your head. Developed by B.F. Skinner and others, the focus is on fine tuning the consequences to behavior, like how and when to arrange rewards and punishments. Behavior management contracts have saved many families from utter chaos.