Amazon (NASDAQ: AMZN), Microsoft (NASDAQ: MSFT), and Alphabet (NASDAQ: GOOG) (NASDAQ: GOOGL) are the second-, third-, and fourth-largest companies on the U.S. markets today. These tech giants have their niches, but they all compete in one massive industry: cloud computing.

Each company already brings in billions of dollars each quarter from this segment and Precedence Research believes the cloud computing market could hit $1.6 trillion by 2030. That's a massive opportunity that this tech trio is racing toward, but which stock is the best buy? Let's find out.

Numbers haven't been updated for the fourth quarter, but in the third quarter, the market share looked like this:

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Source Fool.com