One is a streaming all-in-one and the other is an amplifier. Judge them on how many boxes you want and what you already own, not on the spec sheet alone.
| Area | Better | Why |
|---|
| Power | B | Sonos Amp has more power - 125W against 100W into 8 ohms. That is about 1dB, which is a small step in loudness but real headroom on peaks. |
| Grip on hard loads | evenly matched | Both behave much the same into 4 ohms - output nearly doubles (200W and 250W). |
| Noise floor | B | Sonos Amp is the quieter design on paper - 116dB against 110dB. Audible mainly with sensitive speakers in a quiet room. |
| Built-in DAC | A | Both decode on board. WiiM Vibelink goes higher - 192kHz against 44kHz. Very few recordings exist above 192kHz, so treat this as headroom, not as sound quality. |
| Streaming | B | Only Sonos Amp has AirPlay 2, Sonos, Spotify, Tidal and Qobuz. |
| Use with a TV | depends | Only Sonos Amp has HDMI ARC, so the television can drive it directly and one remote controls the volume. If the system is for music only, this changes nothing. |
| Room to grow | B | Only Sonos Amp offers preamp outputs and a subwoofer output - which decides whether you can add a subwoofer or a power amplifier later without replacing the box. |
| Shelf space | depends | WiiM Vibelink takes up about 17% less shelf area (430cm² against 518cm²), and it is 23mm shallower, which is the measurement that decides whether a rack door shuts. |
| Price | A | WiiM Vibelink costs less - $299 against $699 at list. |
| Watts per dollar | A | WiiM Vibelink is the cheaper watt - about $3 per watt against $6. A blunt measure, and it says nothing about how either sounds, but it is the honest one for raw output. |
A WiiM Vibelink B Sonos Amp
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 amplifiers are judged; anything missing on either side is left out rather than guessed.
Which should you choose?
The usual trade-off: Sonos Amp measures better, WiiM Vibelink costs about 57% less. With most speakers in most rooms that gap is smaller in practice than it looks here. If this sits under a television, Sonos Amp is the one to buy - HDMI ARC means the TV remote controls the volume and there is no second box in the way. Think about the whole system: the roughly $400 saved by taking the cheaper one would buy better speakers or a subwoofer, which does more for the sound than the difference between two competent amplifiers.
What a spec sheet cannot show: how either sounds with your speakers, how the controls feel day to day, and what the app is like to live with - which is where most all-in-one amplifiers are actually won or lost. Power figures are the manufacturers' own and are not measured to a common standard, so treat small differences as noise. If you can hear both, that will tell you more than any row above.