Is your idea of taking a teacher training course in Florence based on the fact that you hope to be teaching there by the end of the course or because you fancy Florence as a city where to study? I’m asking this because if your idea is to find employment in Florence or Tuscany then you might as well contact a few English language schools there and ask them what type of Certificate they favour when it comes to their employment requirements. That might give you clues as to which certificate program you should take.

Hope this helps