As for the movies, Ryan, I have to say I prefer the LOTR movies to the Narnia ones, because there is a lot more romance as well as some incredible battles and they bring the depth of the books to the screen perfectly. But I like them better only by a hair, I'm a huge fan of both.
As to the books,I voted Narnia simply because the characters in those books are closer to my heart. I adore LOTR as much as the next fantasy buff, but I'm not nearly as obsessed as some get. I've only seen the movies once, I've never learned a word of Elvish, and I've only read the books once, and yet, I feel my life is complete.
Narnia is far less heavy than LOTR, which is nice in a way, and as I said, I'm fonder of the characters which is what brings it to the top for me. Also, most people would say LOTR wins over Narnia and I just like to be on the controversial side
PS, I'd just like to randomly throw out a pet peeve: yes, Tolkien was Catholic, but GANDALF IS NOT A CHRIST FIGURE! THERE IS NOWHERE IN THE BOOK THAT HE DIES!