which genre do you prefer and why?
I define science fiction as any story which contains currently impossible, unlikely or speculative events that, in the context of the story, can be explained rationally (even if the explanation is pseudo science). I define fantasy as any story which contains impossible, unlikely or speculative events that are presented as fundamentally unexplainable or supernatural.
In practice, I've always preferred science fiction even though I've been trying to read more fantasy lately. In theory, fantasy appealed to me more because I thought that it required more imagination since fantasy doesn't need to be explained and the possibilities are limitless. I'm not sure this is true anymore, you could argue that science fiction requires more imagination since science fiction writers have to imagine an explanation for unusual events in addition to the unusual events themselves. I've always loved African and Greek mythology but most modern fantasy is based on medieval European culture and I can't really relate. Plus, the themes are often repetitive. I like more science fiction shows/movies than fantasy ones as well.