Hi which type of relation is best to use for create relationships ? E.g. user as an account owner:

oryKeto.CreateRelationshipBody{
  Namespace: &ketoService.Namespaces.ACCOUNT,
  Object:    &userIdStr,
  Relation:  &ketoService.Relations.OWNER,
  SubjectId: &userIdStr,
}

or

oryKeto.CreateRelationshipBody{
  Namespace: &ketoService.Namespaces.ACCOUNT,
  Object:    &userIdStr,
  Relation:  &ketoService.Relations.OWNER,
  SubjectSet: &oryKeto.SubjectSet{
   Namespace: ketoService.Namespaces.USER,
   Object:    userIdStr,
  },
}