The Catholic Church bears the four marks: one, holy, catholic (universal) and apostolic. Let’s use that as the measure for the two forms.
One: The UA is the Mass our Church offered for centuries. It connects us with the saints and holds the Truth.
Holy: The UA reserves the sanctuary for the priest and his assistants. The NO has a flury of laity entering the sanctuary, the tabernacle may not be there, there are fewer genuflections and signs of the Cross, and unconsecrated hands distribute Communion in the hand to those standing
catholic (universal) This should almost be self-explanatory. The UA is the same everywhere it is said. The NO is like a box of chocolates.
Apostolic: The UA developed slowly, organically over centures. The NO was written by Annibale Bugnini who was later semi-exiled to Iran and is not recognized by the Church.
You’d think that the man who gave us this new Mass would be a saint by now. Yet, most Catholics don’t know the name nor the circumstances surrounding his creation. The greatest liturgical change in the Church’s history and yet no sainthood, devotion, church named after him, or other special form of recognition. I wonder why?
*"Even the Protestant reformers recognized the connection between Church teaching and the Mass. Luther felt that by overthrowing the Mass, he would overthrow the papacy. He and other Protestant reformers made it a point to eradicate the idea of sacrifice from their “reformed” liturgies. Altars and crucifixes were removed, and Scripture readings and sermons replaced the concept of the Real Presence of Christ in the Blessed Sacrament. This was done gradually, so that Catholics, who, after all, were going to the same churches and often had the same pastors, were hardly aware that they were little by little becoming Protestants.
Since the early 1960’s, many of these same changes were gradually introduced into Catholic churches. Then in 1969, the Mass was rewritten by a Vatican commission assisted by six Protestant theologians. No references to the Mass as a sacrifice remain in the new liturgy, which is defined as “the memorial of the Lord” and closely resembles a Protestant service. The New Mass is not an expression of the traditional Catholic Faith but of a new ecumenical religion".
Because of the hallowed sacredness of the Roman Rite and to protect it, Pope St. Pius V codified the Traditional Latin Mass using the strongest language in the proclamation Quo Primum in 1570. It says in part:
"At no time in the future can a priest, whether secular or order priest, ever be forced to use any other way of saying Mass. And in order once and for all to preclude any scruples of conscience and fear of ecclesiastical penalties and censures, we declare herewith that it is by virtue of our Apostolic authority that we decree and prescribe that this present order and decree of ours is to last in perpetuity, and never at a future date can it be revoked or amended legally. . . .
“And if, nevertheless, anyone would dare attempt any action contrary to this order of ours, handed down for all times, let him know that he has incurred the wrath of Almighty God, and of the Blessed Apostles Peter and Paul.”
Despite such a forcible proclamation, the new rite was introduced in 1969. For what reason would the pope ever change the Mass and what are the differences? The use of the vernacular as opposed to Latin in this rite represents a minor difference between the two Masses compared with the other changes. A total of 35 prayers or about 70% of the Tridentine Mass was replaced or discarded. *
queenofangelscatholicchurch.org/LatinMass