Bluesound Vault 2i, Cocktail Audio X40 or ??????????

My error on Pandora..
Radio stations supported; Calm radio, iHeart radio, Radio Paradise, Slacker radio, TuneIn radio.
Music services supported; Amazon music, Deezer HiFi, Groove, Juke, KK Box, Murfie, Napster, Qobuz, Spotify, Tidal and WiMP.
I think a lot of people are using Roon integrated with Bluesound with great success.

The streaming you have. And it works very well. But the built-in wifi you miss with the Vault. Or am I wrong? Note that the new i-series is out now and the reviews says considerably better sq. Maybe just marketing.......

I believe the I-series uses a different DAC so I am willing to believe it may sound better, but if you use an external DAC that would be a non factor.

I ripped my CD's with dbpoweramp to wav file . I didn't change any settings other than  rip to wav and where to store the files and my Node2i found them without any problem when I hooked it up and built the index.  Maybe dbpoweramp stores in the format needed  for the album art?  I use an external dac which sound significatly better than the one in the node2i not sure about the vault 2i. 

What I understand its the same DAC in node2, node2i, vault2 and vault2i. But the i-version includes other techniques taken from the NAD M51 which is said to have had a "big" positive effect on the sound. 

@djones51 
Can I ask what DAC would sound so much better? Have you had the possibility to a/b test?