Best Stock to Buy Right Now: Sirius XM vs. Spotify

Which digital audio stock is the better buy?Digital media is kicking old-school radio to the curb. That's not a new event, but a long-term trend. SiriusXM Holdings (SIRI 0.78%) and Spotify (SPOT 3.27%) are two of the biggest names in audio-based entertainment these days, and these two companies approach the same market from different angles.One is a profitable growth stock with a lofty valuation. The other is an unprofitable veteran with a stock so cheap, legendary value investor Warren Buffett is buying it ...