The Moon 240i (DAC integrated) was also in my upgrade shortlist, as well as the Hegel H190, also a DAC integrated. But then the AHB2 "came along". I can pair the Benchmark with a Topping D70 for about the same coin as the Moon and Hegel.
I've only discovered the Bryston B60 in this thread but the $ per watt is arguably encroaching high end territory.
Speakers are not a passive load. They generate its own voltage which then feeds back the amplifier. Amplifier then tries to damp these parasite signals the best way it can - but it's never perfect and various amplifiers do this with various success. Measurements being done with passive resistance don't cover what will happen with real speakers. Does it generate additional distortion, this feedback from speakers? Why, of course it does - there's a parasite signal that should not be there at all in an ideal case - which never happens in reality.
Also, music is by its nature is full of transients, short bursts of peak current being drawn from the amplifier, while relation of transients power to RMS is said to be 10 to 20 times. Meaning, if you listen at the average power of 15W, peak power may get as high as 300W. While some amplifier may have, say, 100W RMS (all numbers per channel) - and still it will be asked to deliver those 300W peak power - and a as a listener, you want the amplifier to deliver those transient without clipping them, with as little distortion as possible (of all kind, both harmonic and intermodulation distortion). If the amplifier was only measured up to its RMS (or lower), you still don't have the info what happens with those peak music signals with power above declared RMS (unless it's already pretty bad below declared RMS).
On top of this all, speakers impedance will vary which further increases demand for peak power...while at the same time it may have its capacitive/inductive part of the load (phase), which make things yet more demanding to the amplifier.
And this is not nearly all.
All in all, one who looks in whole complexity of amplifiers, understands that set of measurements performed simply cannot seriously cover all what it takes to make a correct, objective evaluation of the amplifier. The only proper way to assess the amplifier is to actually connect it to the speakers you want to pair it with...and listen to it. Best when using a variety of music content and enough time span to evaluate it properly. The traditional way, still unbeaten. But whoever trusts those few graphs to tell him all he has to know about the amplifier...well, good luck to you, folks
you're gonna need it...