So long, Google Assistant
We have confirmed the option to change the default assistant is present on the Pixel 2 XL ($850 at Best Buy) and Samsung Galaxy S9 ($219 at Back Market). Due to each device manufacturer customizing the settings app and menu, the steps will differ from device to device. Adding confusion, the setting isn't all that easy to find.
For example, to find the setting on a Pixel 2 XL, you need to go to Settings > Apps & notifications > Default Apps > Assist app.
There is a better way: Open your phone's search feature within the Settings app and type in "Assist."
Once you've located the proper settings page, you will have the option to change from "Enhanced Google services" (AKA Google Assistant) to a different assistant, as long as the app is installed on your device.
Of course, there is a caveat to ditching Google Assistant. First and foremost, this setting isn't a complete and total replacement.
For example, you can't talk to Alexa or Cortana using voice commands from across the room. Instead, you have to long-press your device's home button to trigger your preferred assistant.
You can, however, still interact with Google Assistant using "OK Google" should you want the best of both worlds.
Smart home compatibility tool: Find out what smart home platforms work with your existing kit and vice versa.
CNET Smart Home: We transformed a real house into a test lab for the hottest category in tech.