They are both comparable to be honest. We cannot say that caceres is a better wingback because he cant defend like licht does,,and also is not like Licht turns into a molinaro once he pass the midfield line.
They are both OK, with their pros and their cons... but nothing to brag about.
If we are talking about effectiveness as a winger, i think isla could outdo both of em...if he is not already doing it. He may not be as defensive... but his offensive aspects brings a lot to the team.