Orthodox has stayed closest to original, ancient Christianity in terms of practice, theology and doctrine. It's primarily a liturgical religion of spiritual exercise and self-purification. So it retains the best methods for actually getting closer to God, i.e glorification, sanctification, hesychasm, theosis, theoria, and so forth.
Also the church services are very pleasant to the senses, sight, smell, auditory. We don't sit down at church, standing helps promote awareness. We have legit priests, and monks via apostolic succession and none (very few?) of the problems infecting western christianity.
Some good reading material would be:
The Incarnate God: The Feasts of Jesus Christ and the Virgin Mary Ed. by Catherine Aslanoff
The Orthodox Way by Metropolitan Kallistos (Ware) of Diokleia
Orthodox Spirituality: A Brief Introduction
by Metropolitan of Nafpaktos, Hierotheos (Vlachos)
The Year of Grace of the Lord
by A Monk of the Eastern Church
The Way of the Pilgrim, by anonymous russian writer
For the Life of the World
by Protopresbyter Alexander Schmemann