I don't know much about the schools you ask about, sorry, other than there is a Cambridge School apparently in local neighborhood, just opened in a villa, must be quite small.  Make sure you research any school you choose for your children, too many for-profit schools out there.  In reply to earlier post, American School of Doha is NOT exclusively for Americans or Canadians - in fact, there are over 65 nationalities at the school.  Compared to other Doha schools, it is fairly expensive if employer doesn't cover fees.