I get asked this question at least 20 times a day at work.
My answer is always. Everybody is going to react differently to each product. Some people get great results with Hydroxycut and get none with Xenadrine. They all are similar and will help you lose weight along with proper nutrition and training.
I usually end up recommended the most popular ones or give out samples if I have any, so my customers can test them and see if their body reacts alright.
Sorry, BUT there really is no right or wrong answer to your question.
PJECT