Let me try this again. I typed out a nice reply, then when I submitted it I got a validation screen, then a 404 error, which doesn't make sense. I hate the CloudFlare software that Audiogon is using on the site. I understand the purpose, but the implementation and execution sucks. Sorry for the rant.
Back on subject...
@wjcasey3rd In my opinion you have kind of answered your own question. You said you love the Aurender Conductor app, so why change? Go with Aurender. However, I'm thrown off by your possible choices: the Aurender N200 or the Bluesound Vault. The suggestion of the Vault makes me think you want to save some money, but then you also threw in the idea of the N200. The idea of the N200 kind of nullifies the idea of trying to save money. I'm with fthompson251. Go with the N150. Is there something in the N200 that is of particular interest, and do you get that with the Vault? If so, what is it? I'm curious.
With the N150, or the N200 for that matter, you get the Conductor app and the local storage that you're looking for. Both are now Roon Read if you were to ever decide you wanted to go that route in the future. With the N150 you save a significant amount over the N200, though it cost a great deal more than the Vault, but again, I don't know the reasons for the suggestions that you presented, so maybe I'm missing something.
There are a lot of great streamers/servers out there and you can't go wrong for the most part no matter what you chose. If there is something you like about the Aurender that is always a safe bet, but on the other side if you don't try something new you don't know what you might be missing.
In the end you have to decide. Have fun with your selection. That's what this hobby is all about, fun. I'm sure you will pick a great streamer.