Q: Does LDAP group's "Import" button sync members of a ldap group?
A: No, it just maps the group to Artifactory. Members of the group can only be added if you have "Auto Create Artifactory Users" enabled at LDAP Setting AND the user logs into Artifactory at least once. Also, Artifactory never saves the ldap user's password.
Q: Which mapping strategy should I choose?
A: It depends on how your LDAP is structured. For example, you may find Static method giving you a faster login experience if the ldap query returns smaller results by using it. The end goal is to find the most efficient search. Please consult your LDAP administrator for advise.