It's difficult to determine which AI assistant is "better" as it largely depends on personal preferences and the specific use case. However, I can provide an overview of the strengths and weaknesses of each AI assistant when it comes to general queries and smart home automation.
In the context of home automation, Siri does have some advantages over Google Assistant and Alexa, especially when it comes to controlling HomeKit-enabled devices. HomeKit is Apple's smart home platform that allows users to control their devices using Siri or the Home app on their Apple devices. One advantage of HomeKit is that it allows for more intuitive control of devices through contextual understanding.
For example, if you have multiple lights in a home, you can group them together in the Home app and give them a specific name like "Living Room Lights." This allows Siri to understand the context and control all the lights in the living room with a single command, such as "Hey Siri, turn off the Living Room Lights." This is more intuitive than having to specify each light individually.
Google Assistant and Alexa can also control smart home devices, but they may not be as intuitive as Siri when it comes to contextual understanding. For example, if you have a bunch of lights in your Living room called "Top Light", "Side Light", etc in the Alexa app, and want to turn off all lights in the room and a command like "Hey Alexa, turn off the Living Room lights" doesn't help, you need to individually command each light to turn them off.
Another advantage of Siri is that it can understand and respond to more natural language queries. For example, you can ask Siri "What's the temperature in the living room?" and it will understand that you're asking about the temperature of a specific room and provide a response based on the temperature sensor in that room. This is because HomeKit-enabled devices provide more detailed information to Siri about the context of each device.
In contrast, Alexa may be more generic in its understanding of voice commands. It may not always understand the context of a command if the room or device names are not specific enough. This is because the Alexa app is designed to support both normal skills and home automation skills, so it may not have the same level of contextual understanding as dedicated home automation apps like the Home app or Google Home app.
Overall, while all three AI assistants can control smart home devices, Siri may have some advantages when it comes to contextual understanding and natural language queries in the context of HomeKit-enabled devices. However, the best AI assistant for your home automation needs will ultimately depend on your personal preferences and the specific devices and platforms you're using.