Which one is the best? Its impossible to answer that question. For some it is whichever is cheapest. For others, whichever has more evidence based data supporting it. For others, the color, look, and feel. And if someone isn't going to use it, it isn't the best.
Its like asking what dental material is the best. Well, each have their benefits in specific situations. Its also like toothpaste - I have patients all the time asking me which is my preference. I tell them just to use one with fluoride and a flavor they like so they'll actually use it. Each person will have their own preferences and this will be "the best" for them.
On a personal note, I use Soniccare only because it was on sale at Costco a while back and I could pick up two of them for a deal.