^ I think the biggest diff is that the Nevatons, to date, aren't being run by anybody terminated in a 1/8" stereo miniplug (correct me if I'm wrong), whereas both the 406x and B3s are. I don't know if it's not possible with the Nevatons or if nobody has tried it, but obviously having to provide P48 and full-size XLRs for them makes them somewhat less low-profile and a bit more cumbersome to deal with generally. I have not heard any recordings with the Nevatons myself but they have lots of fans it seems.