Wattage 4 or 8 ohms?

I've got no argument with you'r table. One can easily see that there is quite an increase in power from 86dB to 104dB. IMHO, and this might be more so with ss than tubes, that one would probably be better off staying away from an amplifiers ceiling of power delivery to keep the sound as clean as possible. One way to accomplish that is to have extra power at hand.

The reason to have a more powerful amplifier is not to play the music louder, but to play the music more accurately. The soundstage "opens up" because the peaks can get louder while the valleys stay quieter. The music also sounds more real because, again, the peaks can get louder. The reserve headroom in the amplifier makes all the difference. The sharp, high peak of a whip crack or even just a smack can require near infinite power to duplicate.

My viewpoint is that playing the music either louder or quieter than the original session is a type of distortion- at least that's what I tell my wife when she wants me to turn it down.

I'm sorry for getting a bit off topic here, but in some instances a higher powered amp might sound better even at volumes that could be handled by a lower powered amplifier. In some class A/AB amplifiers designs the bias of class A before going into class AB increases proportionaly to the total power output..