I tried out both a couple years ago, found them to be pretty comparable in terms of music catalog, and chose Rdio because I prefer their interface.<p>Recently, I&#x27;ve been noticing that some of the &quot;people&quot; I follow have stopped publishing playlists to Rdio in favor of Spotify, so I&#x27;ve been considering the switch.  But it&#x27;s a shame to have to leave Rdio&#x27;s great HTML5 web interface for either Spotify&#x27;s native app or flash.