Hi - have a look here which I recently posted on. I lost half a stone on SW then lost and gained the same couple of lbs for months - it really didn't fit in with my lifestyle.
If you look through the main WW forum you will see quite a few discussions of sw v ww. Of course on the WW forum, 99% of people are going to say WW so in the interest of balance you might want to ask the same question on the SW forum if you haven't already
I lost 3 stone on WW, had a year off and went to SW as I'd put on some weight.. I DID lose 8.5lb in 4 or so weeks, but I just could not be bothered with the cooking, and I couldn't stand the meetings. I enjoy making meals from scratch - just not every day, and I love treating myself to normal pizzas and stuff. I think that's why my losses are consistent with WW, slimming world I never know if I was eating too much, or not enough