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 | Devialet Expert 220 Pro has more power - 165W against 100W into 8 ohms. That is about 2.2dB, so it plays usefully louder before it runs out and has more in hand on peaks. |
| Room size | depends | We rate Accuphase E-3000 the better fit for desk or near-field listening, a small room and a mid-size room, and Devialet Expert 220 Pro for a large room and a very large room. Match the amplifier to the room you actually have, not the one you want. |
| Speaker load rating | B | Devialet Expert 220 Pro is rated down to 2 ohms against 4, so it is the safer partner for a low-impedance speaker. |
| Built-in DAC | B | Devialet Expert 220 Pro has a DAC on board; the other needs an external one, which is another box, another power lead and another purchase. |
| Phono stage | depends | Devialet Expert 220 Pro has a built-in phono stage (MM,MC) and Accuphase E-3000 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 | A | Only Accuphase E-3000 offers a pre-out/main-in loop - which decides whether you can add a subwoofer or a power amplifier later without replacing the box. |
| Amplifier class | depends | Accuphase E-3000 is Class A/B and Devialet Expert 220 Pro is ADH (Analog Digital Hybrid). 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. |
| Price | A | Accuphase E-3000 costs less - $9,500 against $10,000 at list. |
| Watts per dollar | B | Devialet Expert 220 Pro is the cheaper watt - about $61 per watt against $95. A blunt measure, and it says nothing about how either sounds, but it is the honest one for raw output. |
A Accuphase E-3000 B Devialet Expert 220 Pro
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?
Devialet Expert 220 Pro leads across most of the measured areas for a fairly modest premium, so it is the easier pick if the budget stretches. Accuphase E-3000 is the one to take if it does not. 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 - Devialet Expert 220 Pro has the headroom, and headroom is what stops an amplifier hardening up on peaks. At desk distance or in a small room, 100 watts is already more than most people ever use, and the extra 65 watts would be headroom you pay for and never hear - we rate Devialet Expert 220 Pro poorly for near-field use for exactly that reason. If you play records, Devialet Expert 220 Pro 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.