I think it is best to understand this as two different markets. Amazon Echo and Google Home devices are mainly about their smart assistants. Homepod is for music, and it competes more directly with Sonos devices.
after today's presentation i'm pretty sure that HomePod Mini is the Apple answer to Amazon Echo and Google Home.
Maybe the HomePod (original) can compete with the Sonos One or Five at sound level but not in terms of features people are looking for listening music such as: virtually all music streaming services available, integration with all the remaining Sonos products for Home cinema or for Home sound system.
To me Homepod Mini is after the home assistant market. The HomePod (original) well it seemed like a shot in the dark now it will most likely get the Homepod mini features.
