Usually, red sauce is on the milder side, whereas Penne all’Arrabbiata is usually spicy. Often they have similar Italian seasonings, though I like to keep all’Arrabbiata on the simpler side and add dried basil and oregano to my basic tomato sauce. In marinara sauce, I like to keep the garlic cloves so they impart a milder garlicky flavor and add a touch of sugar to balance out the acidity.