Most certificate programs also assist with job placement. ITC Training in Prague and Barcelona . There is a demand for English teachers in virtually every non-English speaking country in the world. You should consider why you are teaching and base your destination upon those objectives. It depends upon location.
Preferred accent is determined by who the host country does the most business with.
In Mexico the American teacher is preferred. In Indonesia a school may prefer the Australian teacher. In Europe British English may be preferred and within the European community teachers from the UK may be the only teachers hired. You may be teaching children, housewives, college students or corporate executives. It will depend upon your employer.