These are not the same size of amplifier: Denon AE PMA-A110 has roughly 2x the power of Naim Uniti Atom. 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 | B | Denon AE PMA-A110 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. |
| Room size | depends | We rate Naim Uniti Atom the better fit for desk or near-field listening and a small room, and Denon AE PMA-A110 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. |
| Built-in DAC | evenly matched | Both have a DAC on board with much the same capability. |
| Streaming | A | Only Naim Uniti Atom has Chromecast and Roon. |
| Analogue inputs | B | Denon AE PMA-A110 takes more analogue sources - 4 against 1. |
| Phono stage | depends | Denon AE PMA-A110 has a built-in phono stage (MM,MC) and Naim Uniti Atom 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 Uniti Atom takes up about 62% less shelf area (781cm² against 2066cm²), and it is 159mm shallower, which is the measurement that decides whether a rack door shuts. |
| Price | A | Naim Uniti Atom costs less - $3,799 against $3,999 at list. |
| Watts per dollar | B | Denon AE PMA-A110 is the cheaper watt - about $50 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 Naim Uniti Atom B Denon AE PMA-A110
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: Denon AE PMA-A110 measures better, Naim Uniti Atom costs about 5% 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 - Denon AE PMA-A110 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 - we rate Denon AE PMA-A110 poorly for near-field use for exactly that reason. If you play records, Denon AE PMA-A110 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.