Interesting question because it puts two legitimate concepts in opposition. One is the view that the less you mess with the signal, the better the sound. Therefore, simple, well-designed amps are “best.” And those are going to tend to be low power. You could argue that means high-sensitivity speakers must follow, so you’ve got the perfect pairing. Except speaker sound is totally subjective (“it’s all in your head!”), and the variations in speakers are vast compared to electronics. After decades of close listening, what if you learn you prefer a low-sensitivity speaker, like Magnepan in my case? Then I say you find the electronics to drive it and just enjoy it.
What is your take on high efficient speakers vs. low efficient speakers?
Consider both designs are done right and your other equipment is well matched with the speakers. Do you have any preference when it comes to sound quality? Is it matter of economic decision when it comes to price? - power amps can become very expensive when power goes up, on the other hand large, efficient speakers are expensive as well. Is your decision based on room size? I'd love to hear from you on the subject.