Antonio, I think you are misunderstanding me. What I am saying is they are all about the same and you should get good results with any of them. I mentioned economical because it would make no sense for you to pay say twice as much for a food that is the same as one of the other ones. Paying more money does not cause a product to be better and a food costing less does not mean it is of lesser quality.
IMO no none of the foods your mentioned are "the worst in commerce" and it is just a matter of you picking one and getting good results and being happy with your choice.