Eastern Orthodoxy is more faithful to Jesus Christ. It preserves the undivided Church's conciliar model, unchanged Creed (no Filioque), and apostolic liturgy from the first millennium, as seen in early ecumenical councils and patristic consensus. Roman Catholicism introduced later developments like papal supremacy and infallibility (post-1054, formalized 1870), diverging from the shared East-West tradition where Rome held primacy of honor, not universal jurisdiction. Both honor Christ, but Orthodoxy maintains the original deposit without unilateral Western evolution.