Reordering Firefox and Brave was never up for discussion in that thread at all, so we simply did not consider it, but we can certainly discuss it here.
I don’t think it has been demonstrated how Brave is better than Firefox in any meaningful privacy-related way. From our perspective they provide about the same privacy protection, some clarification about this will eventually be added when we publish our browser fingerprinting overview.
Given that we consider them to be roughly the same technically speaking, the order is more arbitrary and basically comes down to a slight preference against Chromium on desktop, because browser engine competition does help prevent anti-privacy features from being steamrolled through to every browser. But they are both good browsers, one just had to be first. We made that decision a while ago, and I don’t see any need to change it without a clear privacy-related reason to.
Edit: This is an excellent resource as well: