Well-established, but wrong. Star Trek fanboys look down on Star Wars fanboys because Star Wars makes no attempt at getting anything science-y realistic. But Star Trek is only like 1% better. Star Trek uses lots of science-y words and completely ignores the science behind them. Trek is science fiction right up until the point where science doesn't cover what they want to do and then they invent fake science to do it anyway. Ask the Q Continuum about how sci-fi Star Trek is.
The difference is in the narrative.
Trek spends a lot of its narrative time discussing the effects (positive and negative) of real life (or realistic potential) technology. You get episodes/movies that explore the morality of cloning, or sharing technology with more primitive peoples, or eugenics, or how technology we create for the good of mankind can be turned into a weapon (Khaaaaaaan!).
Meanwhile the only real discussion of "science" in Star Wars is if it's better to use a blaster or a light saber. Star Wars plots completely revolve around the politics of high born people and little else. The science is never questioned, the only thing questioned is the morals of whoever has their finger on the trigger of the big gun. It doesn't even try to explore how someone could make a weapon big enough to destroy a planet, just that it exists and we have to hit it in one little spot that somehow engineers that designed such a marvel missed so we can blow it up.
It all makes sense if you know where Star Wars comes from. Star Wars is a combo of pulp Sci-Fi (aka racist Flash Gordon comics) and a Camelot era fantasy with laser swords instead of real ones. It was never meant to make you think about the technology, more thought was put into how the special effects should be achieved compared to why they should exist in said universe. And there is nothing wrong with that- Star Wars was the printing press of big budget action movies. The world was never the same afterwards for the good of us all! Some people will never like Sci Fi that is Sci Fi, but Star Wars being dressed up like Sci Fi plus it's massive success pumped more money into the production of real good actual Sci Fi in the late 20th century than everything Trek ever did. Both are important to anything we call Sci Fi today.
But out of the two Trek (minus the recent movies) is much more Sci Fi than Star Wars.