The main differences between Cincinnati Chili and a traditional Tex-Mex chili is that the meat and onions are very finely chopped (similar to hot dog chili) and the seasonings are certainly unique with unsweetened cocoa powder, cinnamon, and clove shining through.
Let's not forget the Cincinnati 'Skyline' Chili Ordering Code:
1-Way: just the chili
2-Way: chili served over spaghetti
3-Way: chili, spaghetti, and grated cheddar cheese
4-Way: chili, spaghetti, cheese, and diced onion
5-Way: chili, spaghetti, cheese, onion, and red kidney beans
All “ways” are served with oyster crackers