I have done both plans and have to say its down to preference. I have lost on both plans. On ww I lost 3st, I then became pregnant and put some on and someone recommended sw I have since lost the pregnancy weight and back to where I left on ww. Anyway rabbiting on, I find sw to be easier to follow as not so restrictive with point counting, although I believe you can do the simply filling plan to save the pointing. I think ww got me to think about portion sizes so that may have helped me with sw, as you can eat as much as you want. When pasta is free, that is dangerous to me! I love pasta but I now have a sensible sized portion.
I say you should give it a go and see how you feel. No harm in trying, if it doesn't work go back to sw.
Hth
Kelly x