Sci-fi, becuase I love those stories that you dream of but could never happen. Mostly stories with magic and stuff becuase it gives me inspiration. Two examples: Lord of the rings (although I didn't saw the last one) and Harry Poter (most people say that I am a child watching this, but I just like magic a lot.
Partially because that's where most of the other genres rear their heads in a conventional way that works. For example there is alwyas comedy in horrors, or the audience would go mad and never be as scared.