I think the of phrase can be much longer than the possessive phrase. Their meanings are the same and they both show possession but the first example that you gave can be longer.
Bloody Marys
Mary's would refer to the possessions of one person called Mary, whereas Marys' would refer to the collective possessions of multiple people by the name of Mary.
There are four different Mary's in the Bible. Mary the mother of Jesus, Mary the mother of James and John (two of Jesus' disciples), Mary Magdalene, and Mary the wife of Cleophas.
The plural form of "Mary" is "Marys."
Which St, Mary's
sss
He is their nephew.
The three Marys at the cross were Mary the mother of Jesus, Mary Magdalene, and Mary the wife of Clopas. They are often mentioned as witnesses to the crucifixion of Jesus in the Christian Bible.
Martha is Marys son
There are many Marys who were nuns. Please be specific.
The plural form of the proper noun Mary is Marys.The plural possessive form is Marys'.example: The two Marys' last names are Brown and Green.
Marys profession was a housewife.