If you like cooking from scratch, SW works well... if you're more a convenience food person, WW is easier and more flexible. SW can be difficult to follow if you're not the most prepared person.
SW lets you eat more of the right things, whereas it's easy to play around with WW and only eat chocolate as long as you don't mind going hungry in between!
Personally I found the constant counting with WW too obsessive, and enjoy the freedom of eating whatever I want, whenever I want with SW, as long as I'm sticking to free foods. And I like the fact that because I rarely use my syns during the day, I've nearly always got enough left over for a Curly Wurly before bed
The Extra Easy plan does what it says on the tin, and really does feel like something I could follow for life... a healthy eating plan rather than a diet
It's the first plan where I've kept the majority of the weight off, even when my life was turned completely upside down a few months ago and I stopped going to class, as it had instilled the right eating principles in me.
So I guess you can tell which way I've voted, but there are pros and cons for both
Good luck with your decision!!