Not specific to schizophrenia - but relevant none-the-less:
Are all psychological therapies equally effective?
Don’t ask the dodo
The claim that all forms of psychotherapy for mental illness are winners, known as the Dodo Bird Verdict, has been dealt a blow
Are some types of psychotherapy really more effective than others for particular conditions? There is plentiful data to suggest that the answer to that question – contrary to Rosenzweig’s theory – is “yes”. But that data tends to come from research conducted by proponents of the ostensibly superior therapy, leaving sceptics to conclude that their conclusions are not impartial.