No single best amplifier here. What decides it is what you have to drive, what you need to plug in, and how much of the system you want in one box.
| Area | Better | Why |
|---|
| Power | A | NAD Masters Series M33 V2 has more power - 200W against 150W into 8 ohms. That is about 1.2dB, which is a small step in loudness but real headroom on peaks. |
| Grip on hard loads | A | NAD Masters Series M33 V2 holds up better into a 4-ohm load: its output nearly doubles to 380W, where the other increases strongly. That matters with demanding speakers far more than the 8-ohm figure does. |
| Built-in DAC | B | Both decode on board, but only Naim Nova PE handles DSD. |
| Streaming | evenly matched | Only NAD Masters Series M33 V2 has BluOS; only Naim Nova PE has Chromecast. Neither list is longer in a way that matters - check the one service you actually pay for. |
| Phono stage | depends | NAD Masters Series M33 V2 has a built-in phono stage and Naim Nova PE does not. Decisive if you own a turntable, completely irrelevant if you do not - and an outboard phono stage is easy to add later either way. |
| Room to grow | evenly matched | The same expansion options on both. |
| Shelf space | depends | Naim Nova PE takes up about 41% less shelf area (1145cm² against 1947cm²), and it is 183mm shallower, which is the measurement that decides whether a rack door shuts. |
| Price | A | NAD Masters Series M33 V2 costs less - $7,399 against $9,999 at list. |
| Watts per dollar | A | NAD Masters Series M33 V2 is the cheaper watt - about $37 per watt against $67. A blunt measure, and it says nothing about how either sounds, but it is the honest one for raw output. |
A NAD Masters Series M33 V2 B Naim Nova PE
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?
NAD Masters Series M33 V2 is the easier recommendation: it leads on most of the measured areas and costs less. Take Naim Nova PE if one of the "depends" rows above describes your system. If your speakers are a difficult load - 4 ohms nominal, big woofers, or a sensitivity in the low 80s - NAD Masters Series M33 V2 is the safer partner, because how an amplifier behaves when the impedance drops matters more than its 8-ohm rating. If you play records, NAD Masters Series M33 V2 saves you buying a phono stage; if you do not, ignore that row entirely.
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.