I would think that right now it would be better to ski in Chile, not Argentina, for a couple of reasons:
1.  Chileans don't have such a good economy, so your $$ will go far there.
2.  Argentina has no real love for americans, so if you go there expect to see it.
If it was me I would go to Argentina, still, b/c it is a much prettier country, and a lot more culture, but that's just me.