Interestingly, Alexa was not the leader in the shopping category -- despite Amazon heading the global e-commerce space -- as Google Home returned more correct answers when asked about product information.
"Google Assistant was the only assistant to properly understand all 800 of the questions, but the others were able to understand 99 per cent or more," said the research firm.
Apple Siri (tested on HomePod speaker), got 74.6 per cent of the questions right, up from about 52 per cent.
The common set of 800 questions were split into five categories - Local information, commerce, navigation, information in general and commands.
Of the five categories, Google Assistant came first on all, except for commands, where it finished second to Siri.
Google Assistant and Siri were well ahead of their peers in the local information and navigation categories.
Google's Artificial Intelligence (AI) and Machine Learning (ML) abilities have bolstered Assistant and so has integration with Google Search and its Knowledge Graph, noted the research.
Amazon and Google accounted for 70 per cent share of the global smart speaker shipments in the first quarter of 2018.
With 43.6 per cent market share, Amazon shipped an impressive four million smart speakers, said market research firm Strategy Analytics.
Google (26.5 per cent market share with 2.4 million sales) and Chinese e-commerce giant Alibaba (7.6 per cent market share) consolidated their number two and three rankings.
Led by Amazon, the smart speakers category in India grew 43 per cent in the second quarter of 2018, said an International Data Corporation (IDC).
Amazon with its Echo range of smart speakers, led the category with 59 per cent market share, closely followed by Google for the second position.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)