Neither one bothers with making even a token effort at scientific believability. So they tie there. Star Wars has at least produced 5 hours or so of watchable stuff, aka the original 3 movies, Star Trek is yet to produce even an hour's worth. Star Wars has produced some memorable quotes, and the chance to pretend to play with lightsabres, Star Trek hasn't. Star Wars has James Earl Jones, Star Trek doesn't. Star Trek has produced decent drinking games, and is watchable then, provided you can heckle the screen, but Star Wars has done the same. Therefore Star Wars is better.