What is the difference between Catholic and Eastern Orthodox?

I have decided to become a Christian, but I don’t know if I should join the Eastern Orthodox Church or the Catholic Church. Besides the Eastern Church not recognizing the authority of the Pope what is the difference? Why don’t they consider Catholic sacraments valid?
Thank you for your service !

The following links should help you better understand the differences between the Roman Catholic and Eastern Orthodox churches. If you have any further questions, please contact Catholic Answers directly.

Recommended Reading:

Differences Between Catholics and Eastern Orthodox
Why I am not Eastern Orthodox
Peter and the Eastern Orthodox

DISCLAIMER: The views and opinions expressed in these forums do not necessarily reflect those of Catholic Answers. For official apologetics resources please visit www.catholic.com.