Both are great for completely different ways. Star Wars is a fun science fantasy romp with memorable characters and amazing special effects. Star Trek is, at its best moments, thoughtful science fiction with some interesting stories, some great and not so great films, and memorable characters.
Personally, I prefer Star Wars because I grew up watching it, and only got into Star Trek in my late teens. However, both have their merits.
Star wars. I prefer the blatant sledge hammer of the Imperial Navy to the quite self agrandising malevolence of the federation. Plus their ships are much cooler and have you seen their uniforms? Imperial uniforms are SOO much nicer than those silly jumpsuits.
I'm a second generation Star Wars fan meaning my father is one and has been since the series came out he watched it 7-9 times when the first one came out haha. And well I got hooked on it when I was a little kid been a major fan ever since bit of a geek in that as well.