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