I have owned both.
I love SW. Great rules & immersion. The Premium is the way to go. I have a lot of fun playing it.
I disliked certain shots on ST & generally just didn't find it fun despite being a big Star Trek fan. I sold it & don't miss it.
I can't agree with the "empty" playfield comments about SW. On ST, the ship is just a bigger version of the tie fighter albeit with drop target/magnet. However, SW more than makes up for it with the Death Star, 2nd LCD screen, and large LCD vs. DMD with movie soundtrack and scenes. The hyperloop is way cooler than the nosediving ship and laser light. As far as bling lighting, I'll give it to ST although SW has a great light show as well.
Voted SW.