This is a really interesting question because the answer is highly disputed. Obviously Australia doesn't have the economic strength of Europe or the North American Free Trade Agreement, but between the two, it can be measured in different ways, many people would suggest that EU is in fact bigger, but by measure of GDP, the EU is dominated by NAFTA with a per capita GDP of just over $21k in comparison to EU28's which is just over $18k
I would suggest that it is NAFTA at the moment but this answer might be subject to change in the future,
