If you're a fan of either series, then guess what? You're a geek, just like me. If you're arguing over which is better, however, you are a looser. Big difference.
To get into the nuances of either series would take forever, but the concept of compairing these two is silly. First of all, any preferece would be a matter of opinion. If you like big explosions and an almost western style of Good vs. Evil, you would tend toward Star Wars. If you like a more technical delivery of tougher moral choices, Star Trek is your game. Compairing them because they both have "star" in title is ridiculous at best, as they are in very different sub-genres. It would be like "Star Man" vs. "Star Search".
Star Wars is a space opera, and is comperable to Dune or Battlestar Galactica, two sources Lucas has admitted to drawing heavily from. Star Trek falls into a military sci-fi, and is best compaired to Babylon 5 or Andromeda. A clear case of apples and oranges, it makes as much sense as compairing "The Good the Bad and the Ugly" with "Moulin Rouge".
In short, get a life.
