Do you prefer Star Wars or Star Trek? I'm a big Star Trek fan. 
The two franchise offer various forms of sci-fi universes. However, will you believe if I told you I have not watched any of them yet
I would not believe you. You've never watched Star Wars: A New Hope or Star Trek: The Next Generation? Why not?
Generally, speaking I like the epic space opera films and mostly i found myself very busy to find time to watch the whole series