I prefer to read as well. I already have the character's voices pegged out in my mind, and if I tried to listen to it and the actor's voice isn't the same as the voice in my mind, then the two clash and I end up unable to follow along with the rest of the story. Aside from that, I would fall asleep if I listened to it.

Our English teacher, when I was in my Jr. year, played Beowulf on tape for us...I fell alseep and snored, and quite loudly too might I add, through the entire thing.

I just enjoyed reading it more and in general enjoy reading anything.