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 | B | Cambridge Audio Evo 75 has more power - 75W against 50W into 8 ohms. That is about 1.8dB, which is a small step in loudness but real headroom on peaks. |
| Room size | depends | We rate MOON 250i v2 the better fit for desk or near-field listening and a small room, and Cambridge Audio Evo 75 for a mid-size room, a large room and a very large room. Match the amplifier to the room you actually have, not the one you want. |
| Grip on hard loads | evenly matched | Both behave much the same into 4 ohms - output nearly doubles (100W and 150W). |
| Built-in DAC | B | Cambridge Audio Evo 75 has a DAC on board; the other needs an external one, which is another box, another power lead and another purchase. |
| Analogue inputs | A | MOON 250i v2 takes more analogue sources - 6 against 1. |
| Phono stage | depends | MOON 250i v2 has a built-in phono stage (MM) and Cambridge Audio Evo 75 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. |
| Use with a TV | depends | Only Cambridge Audio Evo 75 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. |
| Amplifier class | depends | MOON 250i v2 is Class A/B and Cambridge Audio Evo 75 is Class D. Class A/B runs warm and is the long-established mainstream choice; Class D runs cool and draws almost nothing at idle. Modern examples of both measure well - judge by the rest of the page. |
| Shelf space | depends | Cambridge Audio Evo 75 takes up about 24% less shelf area (1190cm² against 1570cm²). |
| Price | evenly matched | Priced within a few per cent of each other. |
| Watts per dollar | B | Cambridge Audio Evo 75 is the cheaper watt - about $33 per watt against $48. A blunt measure, and it says nothing about how either sounds, but it is the honest one for raw output. |
A MOON 250i v2 B Cambridge Audio Evo 75
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?
Cambridge Audio Evo 75 has the edge on paper, though not by much. The rows marked "depends" are more likely to decide this than the score is. If you play records, MOON 250i v2 saves you buying a phono stage; if you do not, ignore that row entirely. If this sits under a television, Cambridge Audio Evo 75 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.