I like Audiogon especially because of some of the regulars who are knowledgeable, helpful, and offer their expertise to the rest of us graciously. I also appreciate the site moderators who have done a good job clearing out trolls over the past year or so. If you look back a couple years and read some of the content posted, a lot of it was pretty hostile No so much today where Audiogon is for the most part very pleasant and enjoyable.
I’ll have to give Audio Aficionado a look see. I enjoy Steve Hoffman which is relatively a more "blue collar" audio site so to speak. I like this site to hear about what the more well heeled (not me) can afford and occasional recording specialists and audio engineers offerings. I also like there are a lot of old guys on this site, having joined their ranks over the past few years..
Mike