Which do you prefer - SCIENCE FICTION or HORROR?

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Yesterday while cleaning my mini storage-library, i've stumbled upon a copy of R.L. Stine's Goosebumps: Welcome to Horrorland. I'm always fascinated by Stine's writing that scares me out of my wits. Later on, after opening a large box i saw the Negation comic collection that i used to read over and over again. I have some other comic titles from crossgen which i bought on a sale in one of the bookstores, but still negation makes all the difference. Wondering around the place, a question flashed before me that goes like this: SciFi or Horror? I just want to know which of those genres would grown-up people prefer to read? I enjoyed reading scifi as a kid since i am the kid that dreams to be a robot someday. But fear is there, that something might crawl under my bed. Now which do you like - scifi or horror?