Every company will have it's own take on how to deliver quality sound...you will find that different high end products DO sound different from brand to brand...IF you pay attention. The differences will be subtle, but can be significant, depending on how intently you listen, and what the quality of the rest of your gear is.
Another really key thing to look at is the software and the interface. IMHO, The BLU OS apps (for Bluesound/NAD products) are the best out there. Not only do they have iOS and Android apps, but also PC and Mac as well! Also, the iOS app also supports the Apple watch! I LOVE being able to adjust volume or track selection right from my watch! SUPER convenient!