The video below goes through a series of voice commends with an iPhone 4S and the Motorola Electrify. Even though Siri might have a bit of an advantage in recognizing conversational language, Google Voice Actions comes out on top when asked to send text messages, find driving directions and load a web page.
Motorola Atrix 2 versus iPhone 4S
Motorola Photon 4G versus iPhone 4S
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