Geert
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This!The Benchmark will be less affected by your speaker's impedance and will be cleaner (lower in distortion) and flatter (in frequency response).
Have a look at Stereophile's measurements, John specifically mentions the high output impedance of the Octave amp: "Measured at the speaker terminals, the output impedance was fairly high, measuring 1.84 ohms at 20Hz and 1kHz, rising to 3.1 ohms at 20kHz. As a result, the variation in the V 80 SE's frequency response with our standard simulated loudspeaker was ±1.1dB (fig.1, gray trace)". It means the Octave will amplify the low end.
https://www.stereophile.com/content/octave-audio-v-80-se-integrated-amplifier-measurements