Responsive Web Design is a way of designing websites based on fluid layer design. By combining a little CSS and Java Script, these pages adapt to the device from which they are viewed, creating a satisfactory user experience regardless of the device from which the website is viewed.
The great advantage of this type of design is obvious: the user experience will always be correct regardless of the device from which it is connected. Also, if you need to update something on the page, it's easier to do it just once and not for each type of domain per device you connect to.
Therefore, if the actions undertaken for SEO positioning are carried out only on one site and not on several, in the link building phase everything will point to the same place and Google will determine better relevance.
Where does the difference between pages lie? In the design. If the same amount of effort is applied for positioning, it is not the same to point to several pages and dissolve, as to point to just one and concentrate.
We invite you to watch the video about a question asked to Matt Cutts, director of Google's web spam department, who gives his opinion on this fairly recurring topic. Although the decision will depend on the type of project being carried out, a Responsive website will always be easier to manage, and it is also the trend for the future.
In summary, Responsive design is one of the best allies for SEO positioning, it helps avoid duplicate content and concentrate all web positioning efforts in a single strategy.
Eduardo Caballero.