I run Unbound alongside Pi-Hole. I’m not familiar with all the features of OPNsense, but pi-hole is convenient because it

- automatically updates the block lists each week

- supports regex filters

- has a admin web interface which makes it easy to view statistics and filtering log, edit the whitelist/blacklist, etc.

Integration of Unbound in OPNsense has the basics - the web interface lets one edit access lists, blacklists etc. but no statistics dashboard or sophisticated log processing. It supports lists with regex though.

Updating automatically requires a cron job, which has to be added by the administrator using the GUI - adding it automatically is a future feature.