Do your devices behind the router get IPv6 addresses, or just the router itself?

I wouldn't be super surprised to see routers getting IPv6 addresses and doing a 6in4 NAT, so devices behind the router get IPv4 addresses.

I would be surprised and impressed if your devices were actually getting public IPv6 addresses.

IPv6 can be kind of unwieldy, but the bigger issue to me is that old and/or very cheap clients (like bargain-bin AliExpress IoT stuff) may not support IPv6 at all.

I believe you can run DHCP for both and let the client pick one, but then you're into running dual-stack routers, and I would be very surprised if ISPs had any interest in supporting them for home use.

I may well be wrong, though. I haven't looked into it in a few years, because my ISP doesn't support it.