An Italian would make a better pope because the Roman Catholic Church is fundamentally Italian and it has been too long without an Italian pope. An African would be a good pope because they've never had one, despite a huge number of Catholics, present and future, being African.
Interesting Fact: There are about as many—if not more—Catholics in the United States (~45-72 million [0]) than there are people in Italy (~60 million [1]). American Catholic theologians, priests, and bishops have a larger impact than many seem to realize.
I'm generally sympathetic with the idea that it is ideal to have an Italian pope—I recall hearing that Pope Benedict XVI thought having a close connection to the diocese of Rome was important—but I also don't mind having popes from different parts of the world so as to better represent the catholicity (universality) of the Church.
I also think an American pope might have a fuller understanding of the global impact of American media and political power. I felt that Francis often did a poor job of navigating the media landscape—oftentimes being represented as saying things which he did not really say or intend, so perhaps an American pope will be better in that regard.
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0. https://en.wikipedia.org/wiki/Catholic_Church_in_the_United_... 1. https://en.wikipedia.org/wiki/Demographics_of_Italy#Populati...