Honestly? None of them. They don’t work and the failure rate where people give up and regain all the weight and often more is over 90%. If you want to improve your health you need a new and sustainable way of eating where you don’t feel deprived and can keep eating like that for the rest of your life. Shakes can also have a bad effect on your metabolism and can make future weight loss harder. You also don’t need to kick-start anything or shock your body or whatever. You will lose weight steadily if you adopt a healthy lifestyle and you will save money. If you don’t feel that you can do a healthy diet at this point, how will you be able to maintain your weight once you lose it?