In the world of personal digital assistants and voice commands, there's no greater rivalry than Microsoft's Cortana, Apple's Siri and Google's Google Now systems. Thanks to Microsoft's continued research into the fields of voice recognition, artificial intelligence, and direct translation, they are quickly catching up with, and may be surpassing Google's product, but Apple's Siri isn't too far behind either. On YouTube we found a series of three videos throwing these rivals against each other in a 50-phrase battle royale. Which one is the winner? We'll let you be the judge! Check out the videos in the thread below.