Having a mobile-friendly website isn’t just good practice — it’s a prerequisite. For the first time in history, mobile has exceeded desktop Internet usage, according to comScore.
GOOGLE SAYS IT'S BETTER
If your site is like most websites, Google brings you more traffic than any other source. Google now estimates that more than half of all searches are performed on mobile devices. If you aren't seeing it yet, you may soon see mobile organic search outperform desktop organic search. While Google doesn't explicitly favor one method of mobile optimization over another in the rankings, the search engine does recommend using responsive design. Doing what your biggest referrer tells you to do seems like a no-brainer.