Hi,
Compared to the really great music film makers, I do not think that they measure up, in terms of the kind of work used, and I attribute that to the fact that they never got to work with better and more important directors, who are better suited to use music with their work, as it enhances the visualization of the film.
I tend to think that too much of these 2 folks' work was in the area of the lesser artistic and more popular films, because the lesser artistic films will not give the time and effort to music, like the good directors do ... except at the titles in the beginning or end! .... WOW!!!!
Of all these, though, Hans probably deserves the better credit since he is one of the primary electronic teachers and users within the art form, although, today, he is not the only one. Between him, Riyuchi Sakamoto and Tangerine Dream, I kinda doubt that many would be as well versed in the art of electronic work as they are.
Strange that you did not even consider Ryuichi Sakamoto ... and he has an Oscar in his closet! But you have not seen any of those films have you?