Is there any truth to this question?

The other thing I forgot to mention is that I have to sit near field < 6 ft due to being wheelchair bound and with the layout of my apartment. I don't listen too loud and with the music I listen to it's rare I push it anywhere near the clipping point.

IMO, the only indisputable comments so far are Pubul57's:

****I have concluded that lower power versions of the same circuit sound better than those iterations with higher power if the power is sufficient to play at a volume you are satisfied with in the room you are using.****

and Tom6897's:

****Absolutes do not exist in audio only in Vodka:-)****

Digepix, to address your question specifically: If the YBA's 50 watts is
sufficient to drive your speakers EFFORTLESSLY, then wether the Krell sounds better or not with those speakers doesn't necessarily have anything to do with it's higher power rating. It may simply sound better because it's a better circuit, or a better circuit for your speakers. Or, it may sound worse; but not necessarily because of it's higher power. Yes, it's true that there is no point in buying more power than needed, but the problem is that what is "needed" is often underestimated.

Curses, Foiled again. I thought for sure there would be just one answer. Is there anything on which all members agree?

"but the problem is that what is needed is often underestimated" and often over estimated also.People usally need 'better' quality and not always more watts.

Amen:)