I used to own a TWD Prem; and I actually prefer TWD Pro. Currently own SW Pro.
I think these 2 pins share many similarities. Both can be brutal, but both can have rewarding ball times. TWD got very much hate early on, but once code got updated and people started learning the rules, it got praised and is one of sterns best. To me, SW is very similar; I think the people that hate this game or simply do not like it don't understand the rules. I was one of them. Understanding what each color of the lights represent and what the sound effect timers mean is key to understanding this pin. Once you learn that, then there's the multiplier rule which can be difficult yet very rewarding - people seem to think you need the multiplier always on, but there's certain modes or points of the game that I find it easier/more rewarding to leave them off since game is so fast, then lock them in when they're at a desired point.
Then, there's theme. SW smokes TWD theme out of the water. Especially since TWD needs customized sound packages to make it better. I'm not sure when stern implemented the better improved call outs for SW, but it really is cool to hear character specific call outs during the game and they did a great job of putting in shot specific call outs that actually aren't spammed like some pins and cleverly placed.
Im really enjoying the paths and strategies in SW more than TWD. SW isn't your traditional style pin, it's much more of a choose your own adventure with different paths and outcomes. Having multiple missions to explore and the rewards for completion progresses the better you do. The multiball stacking in SW is pretty phenomenal and actually beats out TWD for that.
All in all I prefer SW pro over TWD Pro and Prem. It's more fun, on the edge of your seat, and the drains aren't as frustrating - I want to press start one more time moreso on SW than I ever have on TWD. I can't comment much about SWLE as I have only played it when I didn't understand the rules and hated the game.
EDIT: one other thing Ill mention. I prefer gameplay of SW over TWD - im not big bash this bash that kind of guy. The horseshoe shot on SW is bad ass; but the ramps in TWD are better than the SW ramps. Outter loop shots are way way better on SW and feel terrific. And, I prefer the drop target system on SW more than TWD. I actually also prefer the center action button rules and usage on SW as well; lots of cool things to know and use with the action button of SW.