There's also vanity DNS for business and enterprise plans - but AFAIU that's basically just slapping another name on cloudflare DNS - not ability to point ns records to non-cf servers?
I have had a good experience with Cloudflare's registry service over the last couple of years.
I have taken to gradually pushing my registrations out as far as they can go. I just occasionally add years onto domains I buy, so as to lock in the $9 price for that term. Seems like an excellent way to avoid inflationary price increases, or general pricing creep.
https://www.cloudflare.com/products/registrar/