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I agree with Anthony. It is important to offer the same experience to desktop and mobile users. A responsive design, in my opinion, is much easier to manage and offers the best user experience. Google has said that they do not have a preference for one version over the other, the important thing is to have a mobile friendly version of your site. I think most professionals would recommend a responsive design unless having a responsive design creates a user experience that would be better if there were simply a mobile version of the site. I think that is the only exception.