Wow! Your piccie Jim. What a difference. Bet you feel so much better!
Right, back to the original question
CS is more like a low carb slimfast. I suppose it's a bit of a mix of Atkins and CD higher plans
CS, if done without tweaking is about 110g of carbs to prevent ketosis. Well, that's what you are supposed to aim for I'm told. It's still lowish carb though and so will help with hunger. The calories are more like a low calorie diet, but it depends what you chose to eat. Many people 'tweak' CS to make it ketogenic, but the diet isn't designed to be so. Personal choice and all that. Calorie levels are about 1200-1500 if done according to the guidelines. I hear the shakes taste good
Atkins is low carb, so you are in ketosis with that. It works on the idea that when in ketosis, your hunger is reduced, so you hopefully automatically reduce calories. Ketosis suits many people as it makes them feel good, and is also protects lean mass usually more than non-ketogenic diets. There is much more freedom on this diet compared to the other two.
If you do the diet correctly, and make sensible low carb choices, it's a healthy diet. Weight losses can be good (especially in men), but many Atkins people find that as they get closer to goal, an awareness to calories becomes more important.
Cambridge. Again, you are in ketosis, and if you do SS, you reduce calories to a very low level. Since the calorie factor is the reason why we lose weight, you can't help but lose...and lose quickly. Being ketogenic makes it easier to manage so few calories as hunger is supressed. Cambridge has everything you need nutrition-wise in the shakes. There are also food options on the diet. It's not just shakes as some people believe. Obviously, more food, more calories, less weight loss...but the options are there.
Hope that helps