Did the columbian exchange bring more changes to the americas or to europe

From the Americas came peppers, maize, potatoes, tomatoes, snap beans, lima, beans, and squash. Maize and potatoes became staple crops throughout Europe. So much so that the Irish potato crop failed, the result was famine. 

From Europe, to the Americas came wheat, rye, barley, oats and millet. The first two crops are used in bread, a mainstay today.