I’ve looked at a lot of Ruark devices, in fact most of them over the last 2-3 years, so know the sonic signature well. It’s very nice, more relaxed than detailed.
I also looked at a Sonos base model last year. It majored more on clarity and control. So they have different sonic signatures. I’d live with either, if really pushed to choose between them I’d probably go Ruark.
If Sonos interests you don’t forget the IKEA Symfonisk variations - a traditional bookshelf model and the one built into a lamp. The bookshelf one is £89 here in the UK. I’d get two and run them in stereo. For which your RPi would need to have a DAC HAT so you could run one cable to each speaker. The Allo Boss is very nice. Or for £25 there’s the IQAudio option - IQAudio now being part of the RPi organisation, which brought with it a price drop. I havent tried that though.