Let's start with this: If you double the watts to the speaker you gain three decibels of loudness, which is barely noticeable. To double the loudness, you would need about 10 decibels, which requires
ten times the watts.
Normal listening levels generally use very little wattage, say less than two watts on the average. Let's use 1.5 watts as an average, and that would most likely be quite loud. So, most of the time, both amps would be equal.
When peaks, or extremely heavy bass, come into play, the watts get drained pretty quickly. An apparent doubling of the loudness requires about 10x the power, or 10 decibels. So, that would mean you're using about 15 watts now.
Twice as loud again, or another 10 decibels, and we're up to 150 watts. So, these can build up fairly quickly and you can see that either amp you mentioned would be outclassed.
But, the good thing is that in the real world, these are fairly well controlled and the only time you'll ever notice any difference is in peaks and even then you might not notice, depending on how loud you're playing your music. And, in the two amps you mention, the difference is less than 2 decibels.
'Of course, if you crank the bass, which puts more demand on the amp, you'll run out of power quicker.
But, as far as speakers are concerned, low-level listening situations are more affected by our own physiology than either speakers or electronics. At low levels we don't hear highs and lows as efficiently as midrange tones. That's why everything sound sflat. Check out the
fletcher-munson studies. These were the basis for "loudness" buttons on older receivers, which varied in their application but generally boosted the bass at low listening levels.
But, ultimately, I'm a firm believer that you can never have too much power, if one uses their head and ears.
