I reread my post. I did not say WHEN the Eastern Orthodox form prevailed, merely that Rome did not succeed in suppressing it. The competition between Rome and Constantinople continued a number of centuries, as is pointed out in this link regarding this slow estrangement. Be sure to click the timeline chart below the explanation. I was surprised to discover that the “Dogmas of Immaculate Conception and of Papal Infallibility were later 1800s doctrines. Below the chart there is also a list of dated events.
http://saintignatiuschurch.org/timeline/
This ‘competition’ you talk about really only dates from the 8th century — before that, before the Arab conquests, you had Alexandria and Antioch as more learned cities, so no direct competition. To the Constantinople people, there was no competition with this city in the far off, barbarian west