Argentina is a very different country to Mexico, the Mexicans are much more pius that the Argentineans, the idiosincracy in Argentina is less religious and more European and lay, consequently here the Roman Catholic Church is more and more small and it only maintains a political power, most of the Roman Catholics are it "socially" but they don't practice their religion actively, then they are baptized and they marry as a social event but the churches on Sundays are more and more empty.
As you could see, this way there are not many Traditionalist Roman Catholics here and it is worse because it is much worse to try with disinterested people for the religion than with mistaken but religious people as it is the case of Mexico.
In the case of Mexican people, I believe that the Orthodoxy could be very successful among them, because people traditionalist Roman Catholic should be enough tired of the Roman Catholic modernism and we should take advantage of the things that we have in common to attract to us as Spiridon said and as Staretz Silouan of the Mount Athos recommended to a Bishop that preached among the Roman Catholic. only saying that they were mistaken, but Staretz Silouan told him "Do they believe in the All-Holly Mother of God and the Saints?, on here you should begin"