Who would you rather have as a dinner guest ?
I always wanted to ask Nietzsche why he was so hostile to Darwin's theory of evolution, which he misinterpreted - imo. During the dinner I could try to clarify that misunderstanding and show him that Darwin's theory and Nietzsche's philosophy are a perfect match.
Definitely not Nietzsche because he'll probably speak as loudly as Zarathusra did in Ricard Strauss' composition. Perhaps Dostoyevsky - if he's already served out the Punishment for his Crime. But he would have to promise to leave the Karamazov brothers at home...