Since I am behind CG NAT I try to use IPv6 for most things at home. It works pretty well most of the time. Also a lot of Software (or should I say games) that claim to not support ipv6 do, as long as you can give them a domain that only has AAAA entries…
SLAAC is pretty cool if it works and if you can weed out all the devices with privacy extensions enabled by default, so you can properly apply rules…
I was using Quad9 for quite some time, but I had consistent problems with the DNS sometimes not working.
In my local network I switched to pihole with unbound as the resolver. Though this does require a bit more setup. I have unbound setup to serve expired records from the cache & prefetch comment queries, this helps with most of the delay.
On my phone I use dnsforge.de when I am not at home for example, and haven’t had any problems with unresponsive DNS so far.