Sonos spies on your usage instead of your audio, and is nowhere near the Homepod in terms of sound quality.
Also, Sonos speakers from my research outperform HomePod in terms of sound - but if you have data to suggest otherwise feel free to share
As far as privacy however, I definitely understand people's worry about the mic, but honestly I think it distracts from really looking at the data tracking practices and how much data is collected even without a mic. See [0]
I'm curious about Apple's data tracking, but based on their marketing page alone it definitely feels like they've given it a big consideration and it's not an afterthought. I cannot say the same for Sonos unfortunately. (I assume Google/Alexa etc are worse, but I don't use those, and didn't dig into it).