Orange Garnet / Beau / Covington - Your traditional and very hardy sweet potato. Baked, Mashed are best.
Japanese Red / White - Sweeter than your orange sweet potato and make a great alternative for soufflé or pie. Even very delicious as a baked potato or mash if you prefer a sweeter but still savory bite.
Purple Sweet Potato are more fibrous and contain more antioxidants than their orange and red counterparts. Great for Baking or roasting.