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 | evenly matched | Effectively the same output - 50W against 60W into 8 ohms is under 1dB, which is not an audible difference in loudness. |
| Built-in DAC | B | Marantz PM7000N has a DAC on board; the other needs an external one, which is another box, another power lead and another purchase. |
| Streaming | B | Only Marantz PM7000N has AirPlay 2, Roon and HEOS. |
| Analogue inputs | A | Rega Brio takes more analogue sources - 4 against 3. |
| Room to grow | B | Only Marantz PM7000N 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 | Rega Brio takes up about 56% less shelf area (745cm² against 1684cm²), and it is 36mm shallower, which is the measurement that decides whether a rack door shuts. |
| Price | A | Rega Brio costs less - $1,100 against $1,299 at list. |
A Rega Brio B Marantz PM7000N
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: Marantz PM7000N measures better, Rega Brio costs about 15% less. With most speakers in most rooms that gap is smaller in practice than it looks here. If you already own a DAC or a streamer, the built-in one is money you are paying twice for, and Rega Brio becomes the more rational buy.
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.