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 | Advance Paris A12 APEX has more power - 180W against 100W into 8 ohms. That is about 2.6dB, so it plays usefully louder before it runs out and has more in hand on peaks. |
| Grip on hard loads | evenly matched | Both behave much the same into 4 ohms - output increases strongly (160W and 272W). |
| Noise floor | B | Advance Paris A12 APEX is the quieter design on paper - 104dB against 97dB. Audible mainly with sensitive speakers in a quiet room. |
| Built-in DAC | B | Advance Paris A12 APEX has a DAC on board; the other needs an external one, which is another box, another power lead and another purchase. |
| Room to grow | B | Only Advance Paris A12 APEX offers preamp outputs and 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 | McIntosh MA252 is Class HD and Advance Paris A12 APEX is Class AB-T. Modern examples of both measure well - judge by the rest of the page. |
| Shelf space | depends | McIntosh MA252 takes up about 34% less shelf area (1347cm² against 2043cm²), and it is 33mm shallower, which is the measurement that decides whether a rack door shuts. |
| Price | evenly matched | Priced within a few per cent of each other. |
| Watts per dollar | B | Advance Paris A12 APEX is the cheaper watt - about $28 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 McIntosh MA252 B Advance Paris A12 APEX
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?
Advance Paris A12 APEX has the edge on paper, though not by much. The rows marked "depends" are more likely to decide this than the score is. 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 - Advance Paris A12 APEX 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 80 watts would be headroom you pay for and never hear. If you already own a DAC or a streamer, the built-in one is money you are paying twice for, and McIntosh MA252 becomes the more rational buy.
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.