Science fiction! It's super cool looking, and it's an opportunity to explore really cool aspects of science that are just barely outside of the range of practicality. It can also include calls to action, to avoid dystopia or push us toward utopia, it can be an exaggerated reflection of the real world that gives us pause, or it can get super weird and cause us to question the nature of reality. But even though those are some of my favorite kinds of stories, sci-fi would be my favorite genre on aesthetics alone.