I owned a well regarded 255wpc powerhouse Hafler DH500 in 1986. My 2023 amps are ~ 17 wpc in triode, 30wpc ultalinear. Granted I don’t try to play as loud as I used to, but the system sure sounds better now.
More power doesn’t equate directly to better sound, unless the amp is straining to produce the needed power. Lower powered amps can sound abso-freaking-lutely amazing...,within their power range. Sound quality really boils down to the given circuitry of an amp, and it’s ability to power a given speaker at the desired volume.
And I do believe there’s an audible difference in the sound of different "well designed" amps, even at the lower volume ranges. If you don’t hear differences, start over, and try a different tact (if you’re interested in that sort of thing)....otherwise, enjoy the music. 😎