Hello,
I only wonder why whoever raised the question has included only two Spanish composers, when by all means there are at least five of them - add De Falla, Debussy and Ravel... Richter was asked of his choise not to play Spanish music, and his responce was "All I wanted, I have found in the French music..." This doesn't answer your question, however. I wish we could resolve these issues like in a competition, by means of a stopper.
Regards,
Dmitri