Books are best for me - you have more time in a novel to expand on a world or universe. Don't get me wrong I love my films, tv, games but they are never as immersive as a good book!
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I like books because for my self,my fantasy is my best.While reading a book,I can imagine everything by myself whereas in other genres to me is offered the way its creator imagined everything and this might not be the same as my image of it.