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I used an adblock package in pfSense but not OpenWRT. The issues I had with pfSense's package was it wasn't nearly as configurable as pi-hole and it used up a bit too many resources on the Soekris 5505 box. I had to uninstall it because it took too many resources.

I ended up installing Docker on my laptop, grabbing the Pi-Hole container, and configuring my laptop to use the docker container as the DNS server.

So far this has worked very well. Wherever I go, I have pihole running in the background. I can access the web interface and do everything I could do on the rasp pi-hole, without the extra hardware. It does take a minute or two to start up in the background after logging in though.

You get a lot more info from Pi-Hole about what IPs and URLs your devices are accessing. Lots of good information outside the ad blocking realm - which devices are phoning home and where and how often is just one example.

Off the top of my head the Adblock might use up CPU cycles on the router, which could cause slower throughput and shorten the lifespan of your router.