This is hard for me because I could say some not so nice things about the quality of some publisher's books. I'd love to be published by Orbit.
I don't have very big opinions of publishers, I guess because for me as a reader, a book is a book! I bet as a writer, they are all so different. It seems like Random House and Harper Teen put out great ones though!
Maybe Penguin because I love a lot of their books. But Poppy is great for light fun books. Also a big fan of Hachette.