I tell you the truth - all of them have good points, but none of them seems to work alone. You have to find those points and try to compensate them adding other methods. The best result will be achieved if you combine as many methods and techniques together as you possibly can. What I say bellow is not a sales pitch. It is pure bitter truth.
Truth is always bitter and sour, that's why nobody likes it.
But, this is my way to deal with everything and everybody. Let's parse those loud promises one by one. 20 are maximum. Just because of that simple arithmetic, you understand that they lie to you. They play on probability.