Narnia, Lord of the Rings and Out of the Silent Planet:
I think now that Narnia and Lord of the Rings is tied for me. Their both so different in nature. Both tell the endless struggle of Good vs. Evil, but each has it's own unique quality. For example C.S. Lewis' approach is a more spiritually blatant, while Tolkien's is more subtle. Lewis identifies Aslan as Christ in Narnia and through his Chronicles there are more spiritual references and allegories from Bible revealed. Tolkien's approach is by teaching deep morals of love, friendship, loyalty, devotion, long suffering, trust, faithfulness, and the nature of power and it's corruption. Both their works are impacting and worthy of being awarded the titles of the best books in literature/Fantasy/Fiction.
I will say however that of the two: The Chronicles of Narnia and Lord of the Rings, that Narnia still leans heavy to being my favorite due to the Spiritual richness of it and the fact that I’ve read through them all.
Now back to the subject, I have somewhat slacked on reading Out of Silent Planet. Just recently I pick it up again and began reading chapter 6. So far I am more intrigued and curious to how the story will further develop.