For “not harvesting the shit out of all your personal data for advertising,” it’s Apple. If you’re in their hardware ecosystem it’s just the best choice in general. But they probably have the least functionality.

For pure functionality and features (but will do the above) it’s Alexa/Amazon. They have the least data privacy.

Ehhhhhh, that’s not quite AI. Unless you count face focus tracking on your 2007 point-and-shoot digital camera also as AI. That’s more machine learning, or in some cases neural nets.