Why?

Why not just look at all the translations and see where they agree... if they have the same root translation and have no cross pollination of sources it would indicate any agreements are more likely to be correct.

Also accessing the earliest and least translated/edited scripture would be the best way to go.

Add in a review of the political system that was editing the scriputre for their own needs will give the ability to figure out why they left in or out various passages.

So my bet would be on the earliest scriptures closest to the source of where christianity grew up.

Also I think the statement that Catholics have one view and the Orthodox a second is an incorrect statement from an ordinal number point of view.

Orthodox predate Catholics, hence it should be:
Orthodox have one view and Catholics have a second... with the assumption that the Orthodox are not predated by any other church... which they were...