Favourite novel's like favourite piece of music, I can't say I have one. There are so many things I like but it all depends on my mood. I'm not being evasive, I've had this discussion several times with people- I just can't say.
I can accept that viewpoint to a degree. Mood does have a good deal to do with it. How about three authors who's works you've enjoyed? I once asked a mate what his favourite Neil Young track was and he said it depended what mood he was in.
Sorry about the delay in responding. I've just finished picking my innards off the floor having split my sides laughing