AOSP with MicroG vs Nextdns with good lists

AOSP with MicroG vs Nextdns with good lists

How better is AOSP or Graphene OS with MicroG or Sandboxed google services compared to just using NextDNS with some good filters.
I mean microg or graphene os will still connect to internet for google stuff I use. Also I can block internet access for a domain using NextDNS which is quite similiar to cutting network access in graphene OS. So how come stock android with NextDNS is less private than MicroG/GrapheneOS.
@privacy