Which unfinished film by Orson wells is based on the film that he claims was the best he had ever made ?  
The Trial (1962 film): The Trial (1962) is a film directed by Orson Welles, who also wrote the screenplay based on the novel of the same name by Franz Kafka. The Trial (1962 film):  Filmed in Europe, Welles stated immediately after completing the film: ""The Trial" is the best film I have ever made".
i don't know