What kind of cheese works well in Italian meatballs?

Two common cheeses for Italian meatballs include mozzarella and Parmesan. The meatball recipe from Betty Crocker requires the use of mozzarella string cheese cut into cubes, while the recipe available from Food Network uses mini mozzarella balls, also known as bocconcini.

The Italian meatball recipe from Betty Crocker requires cooks to cut up the cheese, and then freeze it for about an hour before preparing the meatballs. The cook creates the meatball mixture, and then molds the meatball around the cheese in the center. The recipe from Food Network also requires the cook to mold the meat mixture around the mozzarella cheese, but it also tells the cook to add Parmesan to the mixture.