Hi
The Rosary is given credit a a valuable prayer, in particular because it has been requested by Mary in apparitions such as at Fatima and Lourdes. Its value isn’t simply in the words or prayers, but in the fact that it is accompanied by meditations on the life of Jesus.
It isn’t the most powerful prayer, the Eucharist is
“The Eucharistic Sacrifice is the source and summit of the whole of the Church’s worship and of Christian life. The faithful participate more fully in the sacrament of thanksgiving, propitiation, petition and praise not only when they wholeheartedly offer the sacred Victim, and in it themselves to the Father with the priest, but also when they receive this same Victim sacramentally.”
“The other sacraments, as indeed every ministry of the church and every work of the apostolate, are linked with the Eucharist and are directed towards it. For the Eucharist contains the entire spiritual good of the Church, namely, Christ Himself, our Passover and living bread, offering through His flesh, living and life-giving in the Spirit, life to all who are thus invited and led on to offer themselves, their labours, and all created things together with Him.” [Vatican 2 9:6]
“The faithful are gathered by the preaching of Christ’s Gospel and the mystery of the Lord’s Supper is celebrated, ‘so that through the Body and Blood of the Lord the whole brotherhood is united…Christ is present, by whose power the one, holy, catholic and apostolic Church is united. For the partaking has no less an effect than to change us into what we have received.’” Constitution of the Church, n.26]