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 | PS Audio Stellar Strata MK2 has more power - 100W against 80W into 8 ohms. That is about 1dB, which is a small step in loudness but real headroom on peaks. |
| Grip on hard loads | A | Denon AE PMA-A110 holds up better into a 4-ohm load: its output nearly doubles to 160W, where the other increases strongly. That matters with demanding speakers far more than the 8-ohm figure does. |
| Built-in DAC | A | Both decode on board, but only Denon AE PMA-A110 handles DSD. |
| Analogue inputs | A | Denon AE PMA-A110 takes more analogue sources - 4 against 1. |
| Amplifier class | depends | Denon AE PMA-A110 is Class A/B and PS Audio Stellar Strata MK2 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 | PS Audio Stellar Strata MK2 takes up about 28% less shelf area (1481cm² against 2066cm²), and it is 132mm shallower, which is the measurement that decides whether a rack door shuts. |
| Price | B | PS Audio Stellar Strata MK2 costs less - $3,499 against $3,999 at list. |
| Watts per dollar | B | PS Audio Stellar Strata MK2 is the cheaper watt - about $35 per watt against $50. A blunt measure, and it says nothing about how either sounds, but it is the honest one for raw output. |
A Denon AE PMA-A110 B PS Audio Stellar Strata MK2
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, PS Audio Stellar Strata MK2 costs about 13% less. With most speakers in most rooms that gap is smaller in practice than it looks here. If your speakers are a difficult load - 4 ohms nominal, big woofers, or a sensitivity in the low 80s - Denon AE PMA-A110 is the safer partner, because how an amplifier behaves when the impedance drops matters more than its 8-ohm rating.
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.