Chopped cheese and a Philly cheesesteak are two different sandwiches. The main difference is that chopped cheese is made with ground beef burger while cheesesteak is made with thinly sliced beef, preferably ribeye. Besides the chopped beef patty, chopped cheese also has tomatoes, lettuce, and grilled onions. Philly cheesesteak, on the other hand, usually has grilled onions, provolone cheese or Cheez Whiz. Sometimes grilled bell peppers and mushrooms are also added.