Is difficult to say, but I prefer science fiction movies because they give us a different kind of topic to thinking about it, such us human belives, filosophy, future worlds, futures behaviors and so on. In other hand, love movies, show us also things to thinking about, but related to the world of feeling and how the characters show those feeling in a frame. Is interesting to say, if you fall in love, maybe you liked love movies. The science fiction movies are more impredictable than loves movies, in general terms. The loves movies are as interesting as science fiction movies.