Nutrients are present in all the fruits but in different quantities. Hence, it is essential to be aware of the nutritional value of fruits before we add them to our health routine. Quince vs Grape Nutrition will help you choose the best fruit among the two. Carbs in Quince and Grape are 15.30 g and 18.10 g respectively. The protein content of Quince and Grape is 0.40 g and 0.72 g. Protein to carb ratio of any fruit must be approximately 1.34. Protein to carb ratio of Quince is 0.03 and in Grape, it is 0.04. Nutritional value of fruits is incomparable to other food items. They provide all the vital nutrients required for proper functioning of our body.