Hi, if you did join slimming world then you would have to syn your smoothies even though fruit is free food, it's something to do with sugars when blending. I prefer calorie counting as I don't feel so restricted. There are somedays that I want to eat something a bit naughtier or I just feel more hungry and I want to eat synned food, which takes me over what I'm supposed to be having each day. With calorie counting I can still have the occasional crazy eating day but I know that if I do then I need to exercise to burn off the extra calories I'm eating. I find this works. With slimming world they don't allow you extra syns if you exercise, calorie counting does. And by calorie counting I mean using the my fitness pal app. Don't get me wrong, slimming world is a good diet with loads of free food options and it has made me think about food differently but it's still makes me feel like I'm dieting. With calorie counting I don't feel like I'm dieting although it is a pain weighing everything out. But it's free! Everybody works differently though. Good luck with whatever you choose!