I haven’t owned the Nano but I have owned the Node N130 and the WiiM Ultra. The WiiM actually sounds a bit better if anything.
The onboard DAC is what determines a streamer’s sound quality. The WiiM has a pretty good one.
Pay no mind to the naysayers suggesting you should spend more. Most of them have speakers and rooms that are far greater bottlenecks than any streamer and/or DAC (not to mention many of them have ears as old as the hills).