They are completely different rides. I much prefer the WDW version to the one in DL. Yes, it's smoother out west, but it's also boring. If it hadn't been themed to Star Wars at the time, it probably would have been a one and done for me. The fact that it's in the dark and you are getting thrown around so much is what makes it fun to me. You're only going 25 mph. I would say being thrown around is a requirement to make it fun at that speed. Smooth coasters are great when they are 200 feet tall with lots of high bank turns and air time over the hills. And for all the complaints people give about Space, Big Thunder IMO throws you around MUCH more. And that's also what makes it fun. I'm not saying the SM track couldn't use some work, but I absolutely do not want to see it completely changed out for a different ride.