Cauliflower and potatoes are both starchy vegetables, but their appearance, taste, and nutritional value are vastly different. Cauliflower has a low carbohydrate content and a high fiber content, whereas potatoes have a high carbohydrate content but a low fiber content. Cauliflower also has a lot of vitamin C and potassium, whereas potatoes include a lot of vitamin B6, magnesium, iron, and copper. Both vegetables are nutritious additions to any meal; however, cauliflower is better suited for people who have diabetes or want to lose weight.