Ah, yes, with JS embedded comments, I’m able to see the comments on a private Discourse when I am logged in to the Discourse, however, not able to see them if I am not logged into the Discourse, a la:
Conversely, with WP Discourse comments, I’m able to see the replies from a private instance even if I am not logged into that private instance or not even a member of it.
I currently have it set up where my Discourse site is login required and yet I want public, non-Discourse users to see the comments on the WP site, so the WP method seems to work best for now.
If I want to allow only Discourse members to see them or I decide to remove the login required option, I’ll probably go with the JS embed because I like the added functionality it gives out of the box.