I have a network with 11 Sonos and 5 airplay devices. I’ve never had any trouble with the Sonos speakers or the app, though I only use the Sonos app for speaker settings, since it can’t control the other airplay devices. I just use Apple Music and airplay and it works fine with the Sonos.
I can’t comment on the issue above about moving them to a new system since I’ve never done that, but I’ve never encountered a glitch in setting them up out of the box.
For sound quality, the Sonos ones will definitely beat out the minis. They are on par with the original HomePod, with the Sonos being more customizable to personal taste since they have individual tone control. They’re more expensive than the minis of course.
They will stream apple lossless, but not high definition - same as the minis. CD quality is what you’ll get.
With the Sonos you have the option of hard wiring them if you have Wi-Fi issues. That said, the wifi on my Sonos ones was far better than my original HomePod. Apple may have improved the wifi on the minis of course.
Apple may have improved their HomePod reliability since I gave up mine, but a glance at the forum tells me that they haven’t. My HomePod experience was incredibly frustrating, and frankly I think that apple’s HomePod excursion is just a big dumpster fire.
If you’re using them for your tv then I’d give serious thought to getting a Beam rather than two Ones, just for the HDMI input. Direct input is always better. I have one and I’d say that the sound quality is about the same. An Arc would be great if course, if you could swing it. And even though you don’t plan on doing the whole surround thing, with any of the Sonos kit, you’ll have the beginnings of a home theater if you ever change your mind. I can say that adding a sub to a pair of ones is transformative and well worth the rather high price.