This is a great article on the effect of classroom quality for preschoolers with autism. As the article points out, most research is done in a clinical or lab setting which can optimize outcomes. This study was done with in the trenches teacher in their own schools.
An important caveat at the end, however, was that these schools were top notch schools. What about early childhood programs where the teachers have not been fully trained in one or both of these methods and neither have their associates?
We need to push for all early childhood programs for children with autism to have comprehensive training for the teachers and associates, so that all of the children in our country have a fair chance of a great outcome.
See on sfari.org