A lot of bakers use unsalted butter so they can have more control over the total amount of salt used in a recipe. https://www.allrecipes.com/recipe/257279/ultimate-butter-pound-cake I, however, have always used salted butter in my baking while still adding whatever amount of salt is called for in a recipe. https://www.yummly.co.uk/recipes/salted-or-unsalted-butter-in-pound-cake Eggs. Both types of butter are made with cream except that salted butter contains salt and unsalted butter doesn’t. I prefer to use unsalted butter, but you can use salted butter as well. Use organic, free-range eggs whenever possible. The amount of salt in salted butter will vary by brand. Salt adds flavor to the butter and, since salt is a preservative, salted butter will last longer in the refrigerator (about 5 months versus unsalted butter, which has a shelf life of about 3 months). However, avoid using really fresh eggs. The only real difference between salted and unsalted butter is literally the salt: All butter is made from milkfat in cream and contains at least 80 percent milkfat, 18 percent water, and 2 percent solids (mainly protein and salt), explains Jen Giambroni, a dairy expert with Real California Milk. However, due to the higher water content in salted butter, there’s a higher chance for inconsistent results when using salted butter as well. Unless your recipe calls for a great deal of butter, salted or unsalted won’t make or break the recipe. https://thestayathomechef.com/traditional-pound-cake-recipe