Once upon a time, Sirius XM (NASDAQ: SIRI) was the elder statesman of digital radio services while Spotify (NYSE: SPOT) played the hungry upstart. As time went by, their roles changed. Now, Spotify has a $50.6 billion market cap and $13.3 billion in annual sales. In the opposite corner, Sirius XM weighs in at $17 billion and $9 billion on the same metrics.

Spotify's fortunes have soared while Sirius XM's starlight faded out. But past performance is no guarantee of future results, and the picture in the rear-view mirror never tells the whole story.

So where are these digital media pioneers going from here? Should investors pick up some shares in Sirius XM, Spotify, or both -- or, just maybe, neither one?

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Source Fool.com