Pandora vs Spotify

After a year on Pandora I have tried Spotify.
Here are my comparisons:

Pandora

• It’s cheaper – $55 USD per year vs Spotify $180.
• Better at random encounters with new artists. The way the playlist work you can’t play a full album, but similar songs are grouped in the same playlist.

Spotify

• It’s the larger service, I have found more instances of links to Spotify than Pandora. There appear to be more artists.
• You can play a full album, and in track order.
• The application leaves screen artifacts when closed. A nuisance but easily fixed with F5.