SLAAC does DNS, with the RDNSS extension enabled. (RDNSS is a feature that was added to SLAAC.)

Some older devices [1] do not support RDNSS. I haven't run into them, but if you're at all worried about it, you can run DHCPv6 in parallel just to hand out DNS settings.

Personally, I just use SLAAC (with RDNSS) and it just works.

[1]: https://en.wikipedia.org/wiki/Comparison_of_IPv6_support_in_...

I run dual stack at home and every device I have connected to my home network runs ipv6 with no manual configuration whatsoever. It’s easier than ipv4 when you consider providing inbound access to resources (no nat configuration)