it's a bit like comparing apples to oranges.
star wars is a few movies (only 2 or 3 of which are worth bothering with), whereas star trek went on for decades as several multi-episode series.
i prefer princess leia to cpt kirk any time, but if a gun were pointed at my head and i was forced to chose, there's only one logical choice: fringe
seriously though, my vote is for the original star trek - the more modern ones just aren't the same. you can't beat the combination of jim, bones, spock and scotty.