It is a question which, although too often, in fact, his answer deserves an adequate explanation, consistent and detailed. All of us engaged in business in the network, we have our own and dissimilar views on the various systems, programs (software), methods, courses, E-books, tutorials, etc preferred sites. etc. This view, beyond that since our inception influenced by sympathy, affinity or empathy for one or the other teachers, is based primarily on the experience obtained each with all these variants previously described and put into practice. Just as we are so different and unique from each other so is the personal experience of each one reached through the different paths that we had to pass along from moment they discover the infinite opportunities, options and possibilities offered by the web. Therefore, you will find different opinions regarding this issue, there will be people who have felt very comfortable and benefit and others not, with respect to Use of this advertising system by Google. Anyway, I think there is a meeting point where, if not all, most agree, and this is that technology is the best and most comprehensive advertising system, is practical, efficient, optimal, complete, and although simple view is shown as very complex in practice it is not. As you can imagine, in my personal opinion is the best system that exists in Internet advertising, then my answer to the question of the title of this article, is of course, devoid of objectivity, but you came here in search of an answer at least guidance.