It's difficult, probably impossible, to answer this question. How exactly does one define 'best'?. You also have to bear in mind that people have different tastes so you can never definitively answer this sort of question.
That said, Russia has produced a lot of great literature. My book shelves are stacked with works from the Russian canon: Dostoevsky, Chekhov, Tolstoy, Bulgakov, Solzhenitsyn, Turgenev etc. I think if there was a vote, Russia or England would probably come out on top.