What is the real difference between Catholic and Orthodox?

That question would take an hour. What I will say is this: the Orthodox life of prayer and fasting does not happen anywhere outside the Orthodox Church. It is an ascetical lifestyle that is unmatched anywhere else and completely reflects the life, ethos, and piety of the early Christians. When you are in the Divine Liturgy, you are stepping back in time to the early Christian lifestyle, love, and asceticism.

Orthodoxy is not just a theological system, although people often misunderstand that. It is a complete and totally immersive way of life that is utterly transformative. And also, it's the church that Christ established.