When I was a kid I was more into Star Wars, but now I much prefer Trek.
I find the SW movies haven't really held up as I got older, though Empire is still pretty good (interestingly, the one I liked least as a child.)
However, I do enjoy the classic Marvel SW comics. I think the style and types of stories SW tells are more suited to the comics form, somehow.

The main theme of Trek is exploration which interests me far more.

Ask me on another day and I might have a different answer, but while Star Trek does a better job at symbolism and meaningful discourse, Star Wars is just so much more fun. I do love both, though

I loved Star Trek from the moment the original series debuted in '66. I was writing Trek fan fiction at age 9, something I'd never done before for anything but the Universal movie monsters, the Marvel Super-Heroes, or the Hanna-Barbera funny animals (the Triune Godhead of my childhood). When the reruns weren't enough, I started amassing the James Blish novelizations, and the Making of Trek paperbacks. The Trek cartoon was the only Saturday morning TV I watched once I hit junior high. We even debated the possibilities of warp drive, transporter tech, and photon torpedoes in Mr. Sherwood's physics class. The show was, and remains, a formative influence in my life.

The Stars Wars movies are usually entertaining enough, but not one has ever given me pause for reflection as Trek has or featured characters I genuinely cared about. I was moved when Jim Kirk died. I just shrugged when Han Solo did. After buying the first Marvel issue, I never bothered with the comics, and I've never bothered with the books or the animated spin-offs. Sorry, Star Wars fans. Maybe at 18, I was just too old for Luke and the gang to instill that sense of wonder and reverence it gives you young'ns.

Cei-U!
I summon the Great Bird of the Galaxy!

I was a huge Star Trek fan and my Star Trek Megos were among my favorite toys, until the summer of 1977. Then I saw Star Wars. I saw it again when it was re-released a year later, the first time I had ever seen the same movie in a theatre twice. Once I got those Kenner Star Wars figures, my Star Trek Megos did not see the light of day to play with again. The Star Trek franchise has been hit or miss for me, and the concepts and universe only pulls me in when there is a great cast executing it well, and outside of the original series, the first 3 movies and the first few seasons of TNG, I have never rewatched anything Star Trek related nor been inclined to do so ( I don't think I have ever watched more than 1 episode of Voyager as the one I wached did nothing for me). Star Wars however, outside of the 3 prequel movies, I will watch or read over and over again if the opportunity presents itself. I've read some of the Trek novels produced through up through the 70s and I would say a third of them I started I never finished because they just couldn't hold my interest, and Trek comics have never really done it for me. I have read and reread a ton of Star Wars books, from Splinter of the Mind's Eye to the original Han Solo trilogy by Brian Daley to the Thrawn trilogy by Timothy Zahn to the current Aftermath stuff being put out, and I could rewatch the Clone Wars and Rebels animated series regularly.

So while I like Trek, and get why people are fans of it, it has just never captured my imagination and esteem like Star Wars has. Now my wife, would tell you this was like picking between her pets, there's no way she could pick one over the other, she loves them both.

-M

Is there a Star Trek vilian that compares to Darth Vader?

Khan is closest. But because of the structure of Star Trek, you have a villain of the week or villain of the movie and there isn't as much time to flesh out their story. Generally, you meet them, learn their motivations, and see them defeated in the course of the one film. I think Vader would still be a great villain if A New Hope was all that existed, but he's even better because we have Empire.