OID or LDAP difference posixGroup vs. groupofNames

In OID or LDAP  there are two ways of grouping users.

The objectClass posixGroup
The objectClass groupofNames.

posixGroup:  Uses the memberUid attribute which contains only the value of the UID of a users full DN. is user is part of this group attribute you need to match is only UID of the user
  For example:
cn=mygroup,ou=Groups,dc=example,dc=com
memberUID: shahbazc

shahbazc is member of mygroup

groupofNames: Uses the member attribute which contains the full DN of the user. complete DN of the member is displayed.

 For example:

cn=myGroup,ou=Groups,dc=example,dc=com

 member: uid=testuser,ou=People,dc=example,dc=com