The best comparison of the church in the Roman and Byzantine Empires from the given options is:
"Both empires embraced Christianity, but the Byzantine Empire based its practices and rituals in the Greek language and culture, rather than in the Latin language and culture."
This statement accurately highlights the cultural differences in how Christianity was practiced in the two empires. The Roman Catholic Church in the West primarily used Latin and was heavily influenced by Roman culture, while the Eastern Orthodox Church in the Byzantine Empire utilized Greek and was influenced by Greek culture.