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Victoria 2 is more trade related as you need to develop industry to alter trade. You have more influence on trade this way plus the sphere of influence gives you trade benefits. Trade is much more developed
 
It's hard to say. Victoria 2's trading game is awesome, because fo how integrated it is into industrial development, diplomacy, and empire building. EU 4's trading game is more interactive. In the end I would say EU 4's is better, because Victoria 2's global economy keeps breaking, which is frustrating (and it was more than just crises :)).