I am also a recent Catholic convert interested in becoming Orthodox. I was drawn to Catholicism from Mormonism on theological and historical grounds. As I continued my studies after becoming Catholic, I learned about Orthodoxy and discovered that the theological and historical foundation of Orthodoxy is even stronger. I am convinced that Orthodoxy better preserves the original, authentic apostolic tradition and has the best claim to be the one, holy, catholic, and apostolic church. The two most important items that make me lean Orthodox are what I consider to be the apostolic origin of the conciliar model of decision-making in matters of faith and morals (as opposed to Rome's doctrine of papal supremacy, which I consider to be a late development and not part of the original apostolic teaching), and the close parallels between the symbols and style of worship in the Orthodox Divine Liturgy and the worship and theology of first century temple-centric Jews, which the apostles were when Jesus called them and gave them the new covenant. As the Jewish temple and its liturgical rites (involving high priest, sacrifice, and the holy of holies) were a prefigurement of Christ our Great High Priest and his eternal sacrifice, it is not surprising that the Christian liturgy developed by the apostles and their successors would expand upon those rites and give them a Christian meaning. Reading the books of Hebrews and Revelation, and the writings of the earliest Church Fathers (e.g., Ignatius, Justin Martyr, Iraneus, Origin and Clement of Alexandria) make clear that the temple and its theology was the touchstone for the first Christians as christian theology and practice developed. The Orthodox Divine Liturgy retains numerous elements obviously inspired by or based upon Jewish temple rites, but are expressed in terms of Our Lord's eternal sacrifice and Christian theology, exactly what you would expect in a church founded by Jewish, temple-centric fishermen. In fact, it's quite accurate to say that if anyone wants to know what ancient Jewish temple rites might have been like, just visit an Orthodox church, which is the only place in the world where echoes of the ancient temple are preserved. Rome used to preserve many of these elements in its Liturgy and plan of buildings, but has since downplayed much of it since Vatican II and the rise of the Novus Ordo rites. To me, Orthodoxy truly possesses the original body of apostolic teaching, even down to the style of the liturgy and the plan of church buildings.