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 | evenly matched | Effectively the same output - 115W against 100W into 8 ohms is under 1dB, which is not an audible difference in loudness. |
| Grip on hard loads | evenly matched | Both behave much the same into 4 ohms - output increases strongly (180W and 160W). |
| Noise floor | B | Audiolab 9000A is the quieter design on paper - 110dB against 98dB. Audible mainly with sensitive speakers in a quiet room. |
| Built-in DAC | B | Both decode on board, but only Audiolab 9000A handles DSD and MQA. |
| Analogue inputs | A | Advance Paris Playstream A7 takes more analogue sources - 4 against 3. |
| Price | A | Advance Paris Playstream A7 costs less - $2,499 against $2,999 at list. |
| Watts per dollar | A | Advance Paris Playstream A7 is the cheaper watt - about $22 per watt against $30. A blunt measure, and it says nothing about how either sounds, but it is the honest one for raw output. |
A Advance Paris Playstream A7 B Audiolab 9000A
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?
Neither runs away with it - they trade advantages. Let the "depends" rows and the speakers you already own settle it.
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.