Very very hard to decide, I think I'm 60% story, 40% world.
I started the Sil, took notes and made timelines to remmember everything, but never finished it because I was to busy with school. I love the story on how middle earth came to exist, but I lost interest when I came to all the different elf-races. Most lord of the rings fans disagree with me, but I don't find elves that interesting. Its the stories of other races that interest me, humans, drawfs, hobbits, elves often seem so... perfect.
You forgot one type of lotr of the rings fans: the hate-the-story, hate-the-world, movie-with-cute-actors-lovers.
