With high efficiency speakers, one can compare high and low powered amps without unfair prejudice against the low-powered amp. My preference tends to favor low-powered tube amps. Tube amps tend to sound more alive and engaging at lower volume levels than solid state. I don’t like most high-powered tube amps because the sound tends to be a bit harsh.
My speakers are about 99 db/w efficient. The amp I am currently running puts out about 5.5 wpc. That is enough for me.