Siropu's add-on is on your site, Discord is off your site.
If your site depends on general chatter, Discord will probably destroy it
![Upside-down face :upside_down: 🙃](https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f643.png)
. If you have a site that deals with a more niche subject, where there are a lot of longform content you can likely make it work.
If you go the Discord route, I would take a look at NixFifty's add-on.