Pandora has been around for a long time and has made a name for itself by emulating radio stations. In recent years, Spotify has exploded not only as a popular music listening platform, but also as a top music discovery service. In my opinion, Spotify has won this Spotify vs Pandora race. For the same pricing, Spotify gives you better audio quality, social features, underground music and music discovery options such as Discover Weekly.
Here's a suggested way for you to download Spotify music without a subscription. You can use AudFree Spotify Downloader to export Spotify songs to your local computer as MP3, AAC, WAV, FLAC files. This way you can download, back up and transfer Spotify music for better enjoyment.