Do you prefer books with one protagonist or many?

Some novels are told from a single point of view. Others invite you into lots of different minds and ways of seeing. Some offer a single main protagonist, but open your eyes to things they've failed to see. And still others let the reader float free over a sea of strangers. So... do you prefer books with one protagonist or with many? Or does it depend on the story, or the author, the writing style, the promise fulfilled by story's end?

For myself, I've experimented with multiple points of view...