General Tso’s chicken sauce is spicier, using chili oil and whole red dried chilies in the dish. It also has a more umami taste, using oyster, soy, and hoisin sauce. Chinese black vinegar adds a unique tanginess. Orange chicken, on the other hand, is more of a sweet and tangy, citrus and soy-based sauce. Both dishes can be coated and fried or simply stir-fried.