A:Answer Hello! I have both the Sonos and Echo devices. I can tell you that the sound is far better on the Sonos, but the Echo also does a great job. The Era 100 is not designed to be compatible with new audio formats such as Dolby Atmos or Spatial Audio, while the Echo has three mid-range speakers (left, right, and up), one forward tweeter, and one 5.25" woofer, and the Sonos has a more refined bass. At high volumes, you can notice a little bit of all the artifacts to control distortion on the Sonos, whereas the Echo is more bass-heavy but not unpleasant and is more suitable for urban rhythms.
Personal recommendation: go for the Sonos and make it a pair.