I asked Benchmark this question and the Node 2i was suggested for its ability to download hi res and stable easy to use interface. The point was made (once again) that the device has no affect on audio quality assuming you are using the digital out. I had been using the Sonos Port which had been limited to 16/44 but with its recent os upgrade (S2) it can apparently download higher quality streams. I use Qobuz and Spotify. Can't say I hear a difference between the Port and Node 2i but haven't had the latter very long and the last thing we need to do here is get into the hi res debate. The Port is a bit cheaper and if you like the Sonos interface, esp with the development of S2, it would be a nice choice. Yes, in either case you are buying a DAC you don't need. Oh, the Node 2i can act as a preamp in a pinch with sub out, trigger etc so it's a more versatile device.
PS- Just heard about the audioengine option, big cost savings
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