These sit in different price classes - Sonos Five costs roughly 2x what Kanto YU6 does. Expect it to lead on paper; the question is whether the gap is audible enough in your room to be worth it.
| Area | Better | Why |
|---|
| Connections | B | Sonos Five adds Wi-Fi and streaming; Kanto YU6 adds Bluetooth, phono and digital inputs. |
| Size | depends | Kanto YU6 is easier to place; Sonos Five is bigger, which usually goes with fuller bass. Your room decides. |
| Expandability | depends | Sonos Five: a sub output; Kanto YU6: a sub output. |
| Price | B | Kanto YU6 is cheaper - $540 against $1,098, about 51% less; arguably a different class. |
A Sonos Five B Kanto YU6
depends neither is better in the abstract - it turns on your room, your system or how you will use them. Only specs published for both speakers are judged; anything missing on either side is left out rather than guessed.
Which should you choose?
Kanto YU6 has the edge on paper, though the margin is not large. The rows marked "depends" may matter more to you than the score does. Think about the whole system, not just the speakers: the roughly $558 saved by taking the cheaper pair would buy a subwoofer or a better amplifier, and either usually does more for the sound than the difference between these two.
And remember what a spec sheet cannot show: how each looks in your room and whether the finish suits it, what dealer support and warranty are like where you live, and how they actually sound to you. If you can hear them first - ideally with your own music - that will tell you more than any number above.