If you're into this sort of thing, Who Would Win in an All-Out Battle: Star Wars or Star Trek? is pretty entertaining. It looks at economic, social, and tactical factors. For example:
Detection, Evasion, Range. These three elements spell the doom of the Empire. The sensors in Star Trek can discern the individual cellular make up of individuals on a planet from orbit, can detect ships from trillions of kilometers away (in other sectors) and can track and successfully target objects at ranges of hundred of thousands of kilometers in space.
By contrast, sensors on a Star Destroyer cannot even detect droids in a unshielded pod. They cannot track down individual aliens (say, Wookie) on a planet, and most combat occurs at visual range with a remarkable rate of misses.