These are not the same size of amplifier: NAD C 379 BluOS-D has roughly 2x the power of NAD C316BEE V2. That is about 3dB, so it is a question of room size and how hard your speakers are to drive, not of one being the better amplifier.
| Area | Better | Why |
|---|
| Power | A | NAD C 379 BluOS-D has more power - 80W against 40W into 8 ohms. That is about 3dB, so it plays usefully louder before it runs out and has more in hand on peaks. |
| Grip on hard loads | evenly matched | Both behave much the same into 4 ohms - output barely increases (80W and 40W). |
| Noise floor | evenly matched | Much the same signal-to-noise ratio (95dB vs 95dB). |
| Built-in DAC | A | NAD C 379 BluOS-D has a DAC on board; the other needs an external one, which is another box, another power lead and another purchase. |
| Streaming | A | Only NAD C 379 BluOS-D has AirPlay 2, Roon and BluOS. |
| Use with a TV | depends | Only NAD C 379 BluOS-D has HDMI, 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 | A | Only NAD C 379 BluOS-D offers preamp outputs - which decides whether you can add a subwoofer or a power amplifier later without replacing the box. |
| Amplifier class | depends | NAD C 379 BluOS-D is Class D and NAD C316BEE V2 is Class A/B. Class D runs cool and draws almost nothing at idle; Class A/B runs warm and is the long-established mainstream choice. Modern examples of both measure well - judge by the rest of the page. |
| Shelf space | depends | NAD C316BEE V2 takes up about 31% less shelf area (1253cm² against 1810cm²), and it is 128mm shallower, which is the measurement that decides whether a rack door shuts. |
| Price | B | NAD C316BEE V2 costs less - $499 against $1,499 at list. |
| Watts per dollar | B | NAD C316BEE V2 is the cheaper watt - about $12 per watt against $19. A blunt measure, and it says nothing about how either sounds, but it is the honest one for raw output. |
A NAD C 379 BluOS-D B NAD C316BEE V2
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: NAD C 379 BluOS-D measures better, NAD C316BEE V2 costs about 67% less. With most speakers in most rooms that gap is smaller in practice than it looks here. Start with the room. In a large or open-plan room, or with speakers that are hard to drive - low sensitivity, or an impedance that dips - NAD C 379 BluOS-D has the headroom, and headroom is what stops an amplifier hardening up on peaks. At desk distance or in a small room, 40 watts is already more than most people ever use, and the extra 40 watts would be headroom you pay for and never hear. If this sits under a television, NAD C 379 BluOS-D is the one to buy - HDMI ARC means the TV remote controls the volume and there is no second box in the way.
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.