George: "Rubber Soul was my favourite album, even at that time. I think that it was the best one we made; we certainly knew we were making a good album. We did spend a bit more time on it and tried new things. But the most important thing about it was that we were suddenly hearing sounds that we weren't able to hear before. Also, we were being more influenced by other people's music and everything was blossoming at that time; including us, because we were still growing."
Paul's favourite album was with no doubt Sgt. Pepper's Lonely Hearts Club Band.
I've read that John said that Sgt. Pepper's was a peak but he preferred the white album because in that record he was himself, though he didn't like the production.
And Ringo said that side two of Abbey Road was the best thing the band did.