Google Home is 6x more likely to be able to answer a question that Amazon Alexa

"New York-based 360i has developed software to determine how well Google Home and Amazon Alexa execute exchanges with human beings. The initial results from the agency, which is part of Dentsu Aegis Network, are intriguing.
So far, Google Home is six times more likely to answer your question than Amazon Alexa. It’s relatively surprising, considering that RBC Capital Markets projects Alexa will drive $10 billion of revenue to Amazon by 2020—not to mention the artificial intelligence-based system currently owns 70 percent of the voice market.
360i’s proprietary software asked both devices 3,000 questions to come to the figure. While Amazon Alexa has shown considerable strength in retail search during the agency’s research, Google won the day thanks to its unmatched search abilities."

Source:  AdWeek, 23rd June 2017