I am reading the different options over here, and I really can't decide if I want NULL blocking or NXDOMAIN blocking.
What are you guys using and have any personal experiences that might help me decide?
You have likely read this: Blocking mode - Pi-hole documentation.
I settled on NULL mode after trying both. It seems to generate fewer repeated requests for the same site. I have had no noticeable lags using NULL.
Note the one disadvantage which mildly annoys other users in my home:
"Blocking page cannot be shown and whitelisting has to be performed from the dashboard or CLI"
Yeah, it annoys me sometimes as well, and straight up confuses some guests. I should probably at least try NXDOMAIN out to see what its like because I have only ever used the default (as the default does work well)
I'm tempted to set up a spare router and have it broadcast a separate guest network that uses Cloudflare as it's DNS resolver. That way, everybody I put on that network will have hotel internet.
Family would go on the regular network, since they all have Pi-Holes at their homes.