One of the key differences is at 400kcal per serving Huel Black Edition is a meal while Huel Complete Protein is 110kcal, making it more of a high protein snack. Whilst both are great sources of protein, the protein in Complete Protein provides a whopping ~73% of the 110kcal, as opposed to the 40% protein in Black Edition! Whilst both are nutritionally complete, as Huel Complete Protein contains more protein per serving, there are fewer carbs and fat than Black Edition.