Samsung HW-Q990D vs Sonos Ultimate Immersive Set with Arc Ultra

The Samsung HW-Q990D is slightly better for most people than the Sonos Ultimate Immersive Set with Arc Ultra, though this depends on your priorities to an extent. Across the board, the Samsung incrementally outperforms the Sonos, except for its stereo soundstage, which is a bit narrower. While capable of heavy bass, the Samsung isn't as rumbly out of the box as the Sonos, but its mid-range is considerably flatter, resulting in clearer dialogue. It also boasts an EQ. Its connectivity is greater, too: there are HDMI In and Optical ports in addition to eARC. That said, if you're already in the Sonos ecosystem, there are advantages to grouping your speakers together from a convenience perspective, and it's easier to incrementally upgrade your system over time, thanks to its modular design. Meanwhile, its actual sound performance isn't completely outclassed, though it does have fewer sound enhancement features.