More locations: Now over THIRTY. More choices: special programs, volunteer positions, language classes. More security: Members of BBB, all courses externally moderated. More Accurate Info: No hand-picked testimonials, all course feedback availble online. More Support: worldwide lifetime placement assistance. More Experience-running worldwide courses for 10+ years. More FUN! ...... TEFL International
IH is a well known international chain whose courses were adapted to form the basis of the CELTA.
That said, most schools are franchises and have to be assessed and sometimes cajoled into meeting certain standards.
Why do you need 'the best school', as opposed to a competent one that runs generally recognised training?