If you are serious about loosing weight, which I can see that you are, then I would recommend a VLCD. Take a look at the Exante, Cambridge, Lighterlife or Lipotrim. You loose around 1 stone a month and replace all of your conventional food with shakes, soups and bars. These are nutritionally complete, and due to ketosis you rarely feel hungry, and the weight melts away. The rapid weightloss means you reach goal quickly and every week you get a boost when you see the scales heading south (or should that be to the left!).
WW or SW are good for a few pounds to loose, but I was down a pound one week, up two the next, down three the next. Was tired with 1lb net loss a month. Switched to a VLCD and lost 1stone a month.
I can't say which is best (depends on the products and your budget) but I would recommend taking a look at the VLCD forums. Good luck and keep us informed of your progress!!! Plus guys always seem to do really well on VLCDs loosing slightly more on average than the ladies according to my counsellor.