I use Unbound locally as a DoH server. The Alpine Linux Unbound package is compiled with libnghttp2, required for the built in DoH listener. That's more than enough to enable ECH [1].
I pre-cache all the domains I use hourly via cron. My ISP is not going to dork with my DNS requests and their employees are bigger deviants than I. If I ever started browsing the web from a phone I would just set up my own public DoH server. It only takes a few minutes and gives me my own query logs for debugging weird issues.
[1] - https://tls-ech.dev/
quad9 seems fine. Glad there are a bunch of alternatives though. We should never stop practicing decentralization in the net.
9.9.9.9 with 1.1.1.1 as secondary
9.9.9.9 is all you need
[dead]
It would be nice if a site like this could offer a basic speed comparison test to your local network.
Imagine seeing response times at P90 for a series of random lookups and comparing the median response times.