Quad9.
Many years ago I used Cloudflare, and more than once I had issues with them blocking websites I wanted to access.
I absolutely despise that. I want my DNS to resolve domain names, nothing else.
For blocking things I have Pi-Hole, which is under my control for that reason. I can blacklist or whitelist addresses to my needs, not to the whims of a corporation that wants to play gatekeeper to what I can browse.