I have done both over the years and can honestly say that CD is by far the best but is a lot harder emotionally rather than physically
I say it is the best because you know you are getting all the vits and mins you need in the shakes / bars etc, the weight losses are fantastic and you don't have to think about preparing meals (well on SS you don't). I have found that doing CD I have been able to start fighting my food demons which I couldn't do on SF.
With CD you have someone to weigh you each week which really helps me keep on track. Going into ketosis on CD does help ease hunger pangs, whereas on SF I was always feeling hungry.
CD is more expensive than SF, but to me the expense is so worth it as I don't have to think about food and my idea of a healthy meal wasn't necessarily healthy enough on SF.
I think if you can be strong willed enough to do a diet like CD and cut out most, if not all, food then it is a fantastic way to go. However if you can't cope with almost toal abstenance then SF is maybe where you should be looking.
I also found that SF was very high in sugar in their products which I didn't like either.
Have waffled, but thats my feeling on the 2 diets. Can I just say thet in the couple of onths I did SF I think I managed to lose about a stone whereas on CD I have been doing it 10 weeks and lost 30lb.
Charlie xx