Last year, Google came out on the Google Developers blog and laid it all on the line by recommending that “webmasters follow the industry best practice of using responsive web design”. You really can’t get more specific than that.
2. No Duplicate Content
Duplicate content is bad for your site ranking. According to Google’s Webmaster Tools Blog “We’ll also make appropriate adjustments in the indexing and ranking of the sites involved. As a result, the ranking of the site may suffer, or the site might be removed entirely from the Google index, in which case it will no longer appear in search results.”
Responsive design means all content is under one URL . No need to worry about getting dinged by Google or diluting your links.
3. Benefit from existing links
Simply put, links are like votes for your website. The more the better. If your site content exists under two different URLs, you are not only diluting your links, but you are also not capitalizing on all the links your original site has already acquired.
4. Lower Bounce Rate
Bounce rate is when a visitor comes to one page of your site and then leaves your site entirely. The Post-Panda world seems to have a negative effect on sites that have a high bounce rate. If your site is the same on mobile, this will reduce bounces from mobile visitors coming to your site expecting to find the same content. Without in-depth analysis, it can be difficult to find out what mobile visitors want from your site content. Responsive design helps keep your web status quo.
5. Easier Indexing
Since your domain and your content is the same, it takes Google crawlers less effort to index your site. If your site is hard to index, it’s probably not going to show up in the Google search results.