A valve amplifier against a solid-state one. They are not really rivals: they differ in character, in what they will drive and in what owning them involves, so start there rather than with the watts.
| Area | Better | Why |
|---|
| Power | evenly matched | Effectively the same output - 180W against 200W into 8 ohms is under 1dB, which is not an audible difference in loudness. |
| Grip on hard loads | B | Anthem STR holds up better into a 4-ohm load: its output nearly doubles to 400W, where the other increases strongly. That matters with demanding speakers far more than the 8-ohm figure does. |
| Noise floor | B | Anthem STR is the quieter design on paper - 120dB against 104dB. Audible mainly with sensitive speakers in a quiet room. |
| Built-in DAC | B | Both decode on board, but only Anthem STR handles DSD. |
| Room to grow | A | Only Advance Paris A12 APEX offers a pre-out/main-in loop - which decides whether you can add a subwoofer or a power amplifier later without replacing the box. |
| Room correction | B | Anthem STR has room correction (ARC (Anthem Room Correction) via ARC Mobile App). In an awkward room that does more for the sound than any other difference on this page. |
| Headphones | depends | Only Advance Paris A12 APEX has a headphone output. Worth something if you listen late, nothing if you never do. |
| Amplifier type | depends | Advance Paris A12 APEX is Hybrid and Anthem STR is Solid State. Valve designs are usually warmer and softer at the limits and need their tubes replaced eventually; solid state is the lower-maintenance choice. This is a taste and ownership decision, not a quality one. |
| Price | evenly matched | Priced within a few per cent of each other. |
A Advance Paris A12 APEX B Anthem STR
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?
Anthem STR has the edge on paper, though not by much. The rows marked "depends" are more likely to decide this than the score is. If your speakers are a difficult load - 4 ohms nominal, big woofers, or a sensitivity in the low 80s - Anthem STR 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.