Brandywine is considered to be one of the sweetest heirloom tomatoes. These tomatoes have a good balance between sweetness and acidity, but they taste sweeter than other tomatoes. Caspian pink and Prudens purple have similar flavor profiles to Brandywine tomatoes, while mortgage lifter is mildly sweet. Purple Cherokee tomatoes have an initial acidic, smoky flavor, followed by a semi-sweet aftertaste.