June 8, 2012 Now I’ll be the first to say that this isn’t going to be a clean fight. Depending on the project, sometimes there is a clear winner. Other times we may struggle deciding which is a better fit. When we as developers encounter the latter, Bing says, a responsively designed site is preferred. According to Bing’s Webmaster Center Blog there are a few really good reasons for backing the responsive route. The biggest reason is their concern for the millions of urls that would be created for mobile specific sites. Here’s a few more reasons if you aren’t quite convinced:
By outputting only one URL for the same content, you will have the following benefits:

• You have more ranking signals coming to this URL. Example: the vast majority of mobile URLs do not have inbound links from other websites as people do not link to mobiles URLs like they link to regular web-situated URLs.
• This is also less search engine crawler traffic coming to your web servers, which is especially useful for large websites. Fewer URLs to crawl reduces the bandwidth our crawlers consume.
• Less work (and potentially less cost) building, updating and maintaining a stand-alone mobile-focused website.

Now that you have a single URL for each piece of your content, how do you optimize your website for different platforms?:

• By performing client browser detection (user agent, customer preferences, etc.), you can still optimize the display for the device your customers are using. This topic is presented in detail in the document Designing Web Sites for Phone Browsers; please note that this document does touch briefly on the subject of redirection to alternate URLs for mobile content, which is not the approach we recommend for best SEO results.
• Also keep in mind our guidance on cloaking. Bing recommends you avoid cloaking

Now to be clear, Google is holding off on giving an official response to the responsive vs. dedicated mobile site debate but seeing Bing’s reasoning, here at VR Interactive, when in doubt… Responsive Design wins.