However, what I wonder is, whatever the Pod we chose, HOW would this civilian led Argentina look like? What would have been the shape of the country if all the governments after WWII would have been civilian, stable and democratic?
Of course, nothing guarantees that Argentina would be prosperous in this scenario. But assuming it did, how would it be???
For me, the economic part is easier to imagine. It would probably follow the path of Australia: transition from agriculture to industrialization during the war, and transition from industry to the services sector by the late XXth century.
Socially, it would probably have high levels of education and would resemble Europe in many of its practice.
Pollitically...no idea. But quite likely a bit unstable and chaotic, resembling more to Italy than to Australia or Canada.
Culturally, it's harder to predict. Probably it would still be the strange mix that it's now, with the Hispanic and Southern European (Italian, mainly) influences being the most influencial. But we have to take into consideration that, if the country is prosperous, there would probably be much more immigrants from South America (Paraguay, Bolivia, Peru and Chile) and Asia (China, taiwan, Corea) than IOTL. And probably also smaller waves of immigrants from the Middle East and Subsharan Africa (there are a few African immigrants in Buenos Aires nowadays). We might see a bigger Chinatown in Belgrano, and the number of Muslims in the country might be higher. What would result of all this,... well, who knows.
And, finally, what about the international position this Argentina would assume? I think it wouldn't be "hostile" to the US, but wouldn't be afraid of pointing out loudly the differences it has with them on several "issues", such as, which is the best way of handling communists guerrilla movements. Who knows, maybe the US would still consider Argentina an unreliable ally, and would favour Brazil or Chile instead.