The wp-discourse-embed plugin uses the Discourse Embed code. Here are the pros and cons as compared to wp-discourse plugin:
Pros:
- Requires minimal configuration
 - Comments HTML is auto created, so styling is not required.
 - Can enable Discourse comments only on posts published after specified date.
 
Cons:
- Not much customizable, hence less features.
 - Comments HTML can not be styled as per the theme.
 
wp-discourse-embed is basically a WordPress plugin for:
This is not possible because the blog hostname should be present in Admin > Customize > Embedding.