Mulberries and blackberries are both delicious fruits with their unique flavors. While mulberries tend to be tart and slightly sweet, blackberries are often sweeter with a hint of bitterness. Both fruits are great in pies, cobblers, and jams, but Mulberry pie is typically made with just the berries and no added sugar, while Blackberry pie generally has a little sugar added. And finally, if you're looking for antioxidants, vitamins, and minerals, both fruits are excellent sources - but blackberries have more vitamin C and B.