I've lived in Auckland - it's nothing like Liverpool (which I lived in and enjoyed) It's not a small working class city - It's huge and quite sophisticated with a very high standard of living. You say they'd hate you? Well, that I can't speculate, but certainly not because they'd find your intellect superior!
Rosario - A big dirty industrial city? Rosario is wonderful, on the river with wonderful restaurants and cafes. And very welcoming locals too.
Have to agree with others that Bariloche, Rosario, Cordoba and Mendoza are all beautiful cities, with educated people, attractive surroundings and interesting places to visit.
So are you any closer to a decision?