I started on LL (many of us CDer's do!) and found the diet great. Wasn't so keen when they put the price up ... and so started looking around and found CD.
I prefered the 1:1 counselling, flevibility of appointments, choice of packs/bars/tetras, price!! and also the eating plans.
My LLC did not really do CBT - stuck us infront of a DVD and then asked questions at the end - but I know lots of LLC are better and that's normally the reason people prefer LL.
Each to their own - and I am certainly grateful to Ll for starting me on my weight loss journey, even if I choose to finish it with CD.