<I> Star Trek, I'm afraid, has past its prime.</i> --Big D

That's certainly true. I mostly lost interest after the TNG.

Star Trek is as close to "good" sci-fi as you can get. Good sci-fi uses technology as a tool to explore human nature, just like any other good book; the setting should be a tool for presenting the theme, the setting shouldn't be the whole point in and of itself. Being TV, Star Trek doesn't come close to a good book or anything of course, but it comes much closer than Star Wars. Star Trek explored subjects like, what constitutes life? Can a machine be alive? Star Trek explored the concept of the nature of god; what constitutes a god? There were many god-like creatures with god-like powers, but were they gods? In one episode a god-like being is found, but it turns out to be only a child. Almost every episode of Star Trek had something to do with a question of morality, and like some kind of philosophical thought-experiment, the setting of outer space let questions of morality be tested in extreme circumstances. You have things like prejudice and racism explored on a grand scale.

Star Wars has nothing but setting. No theme of any significance, hardly any character development. It always came across to me as something for children. People playing with swords, flat lifeless characters, mindless "good vs. evil" type battles. The high point of Star Wars: Yoda in a light saber battle. Mindless entertainment. Throw in some pseudo-religion, so people can think it "means something" (though exactly what it means, I don't think anyone could tell you), and there you go.