#1 Vitamin content comparison Potatoes are a great source of vitamin C, providing around 30% of the daily recommended intake per medium-sized potato. #2 Mineral richness in potatoes Potatoes are rich in potassium, which is essential for heart health and muscle function. While turnips also provide potassium, they have less than potatoes but make up for it with calcium, which helps maintain bone health. A medium potato has about 130 calories, while a similar serving of turnip has roughly 36 calories. Potatoes have a higher carbohydrate content than turnips but also provide more energy-boosting carbs, which can be beneficial for active individuals.