It's not the price of power that matters, it's the heat produced. Every extra W consumed is an extra W of heat that needs to be handled, and for consoles that tend to be chucked into confined spaces, that's an issue.

Loudness might be subjective, but if we're trying to compare builds, they should at least be in the same ballpark.

Looking at this article, they seem to only care about one dimension of this product: cost. It would have been far more interesting if they explored: cost, performance, size, heat (by proxy of power consumption), and loudness.