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 - 350W against 300W 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 nearly doubles (700W and 580W). |
| Noise floor | B | Peachtree Carina is the quieter design on paper - 116dB against 105dB. Audible mainly with sensitive speakers in a quiet room. |
| Built-in DAC | B | Peachtree Carina has a DAC on board; the other needs an external one, which is another box, another power lead and another purchase. |
| Headphones | depends | Only Peachtree Carina has a headphone output. Worth something if you listen late, nothing if you never do. |
| Price | A | PS Audio Stellar M700 costs less - $1,749 against $1,999 at list. |
| Watts per dollar | A | PS Audio Stellar M700 is the cheaper watt - about $5 per watt against $7. A blunt measure, and it says nothing about how either sounds, but it is the honest one for raw output. |
A PS Audio Stellar M700 B Peachtree Carina
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: Peachtree Carina measures better, PS Audio Stellar M700 costs about 13% less. With most speakers in most rooms that gap is smaller in practice than it looks here. If you already own a DAC or a streamer, the built-in one is money you are paying twice for, and PS Audio Stellar M700 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.