Who is the teacher trainer? For example: Is the Yoga instructor training program directed by a Yoga teacher? Is the Yoga teacher, in question, qualified to teach Yoga instructors and interns? Please be sure that you study with an organization that specializes in developing Yoga teachers. If the same organization creates certifications for computer languages, and gun smiths, it may not be in your best interest to sign up.
Where do you start, when considering the many paths of Yoga teacher training? It is always best to compare Yoga certification programs to each other. There are many factors that you might want to take into consideration. Unfortunately, much of your decision making, when choosing a course, depends on time, obligations, money, and flexibility in your schedule.