@ManImCool Adguard as addon installs the server that allows to filter requests - it is required if you don’t have a preexisting server.
Adguard as integration allows interaction and visualization with home assistant from an existing server, such as the one that runs from the addon, or a server located on another system - it is therefore optional. Honestly I only use the integration to monitor adguard speed. It also allows for example to enable or disable functions from your lovelace dashboard.