Yeh it seems silly to have two threads going.
But just to explain SW, I don't know WW, and I have lost 2st 11lbs (in 18 weeks! while breastfeeding)
SW you have red or green days. On a green day you eat unlimited pasta, rice, potatoes, all veg, fruit, eggs, quorn, cottage cheese, low fat yoghurt and a wide variety of 'branded' foods from the supermarket. Red days are unlimited meat, fish, poultry, veg except potatoes, fruit, eggs, quorn and cottage cheese and yoghurt. On either day you have a choice of 'healthy extras' and 'sins' which are the only foods that need weighing. Healthy extras include milk, cheese, bread, breakfast cereal and cooked fruit on both days, and on green days a small portion of meat, fish or poultry. On red days a small portion of pasta or potatoes. Sins are all other foods which you choose (chocolate, chips etc) and you have some of these every day.
I have found this plan really easy as they are big into 'non guilt eating' you can eat as much pasta as you like on a green day, none of this 'average portion size' or 2oz dried weight.
If you are serious about losing weight classes work because you suddenly find out you are normal, and that others struggle too. Also you get the support where sometimes family and friends seem to try to sabotage things. I am a big fan and reached my target weight today, 9st 11lbs!!!