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 | Michi Prestige S430 has more power - 250W against 170W into 8 ohms. That is about 1.7dB, which is a small step in loudness but real headroom on peaks. |
| Amplifier class | depends | TEAC AP-701B is Class D and Michi Prestige S430 is Class A/B. Class D runs cool and draws almost nothing at idle; 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 | evenly matched | Priced within a few per cent of each other. |
| Watts per dollar | B | Michi Prestige S430 is the cheaper watt - about $16 per watt against $24. A blunt measure, and it says nothing about how either sounds, but it is the honest one for raw output. |
A TEAC AP-701B B Michi Prestige S430
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?
Michi Prestige S430 has the edge on paper, though not by much. The rows marked "depends" are more likely to decide this than the score is.
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.