The best approach is to only buy audio products that have been objectively measured by the manufacturer with the results made public (Schiit, etc.) or have been carefully measured by folks like ASR or Audioholics or a few others. That way you can escape from your cave of uncertainty about your own hearing or limited knowledge about science and engineering using expert advice that brings about a Xanadu of confidence in the performance of your equipment, and so will you rise into the nirvana of audio bliss. 
Are all streamers the same?
Dogma says they’re all the same. Experience suggests otherwise. Price may or may not be guide. Are there solid tech reasons such as bleed of noise into the digital signal? What does “it’s all about the ‘implementation’”really mean? How come power cords and interconnects make a difference? For example, there are numerous USB cords that separate the power from the signal cables to minimize interference and noise transference.
Why don’t we have an accepted science of audio, as yet? Where’s the research compilation esp at textbook level? Yes I’m happy just listening and using my ears and my biases to make judgments; no problem.
Yet I continue to see dogma, from the USA and Europe, indeed everywhere, that remains steadfast in their disbelief in variances. It becomes tiresome at times. But hey what do I care? Lol, my pursuit of fidelity and knowledge remain equally strong.