Brown sugar comes in light to dark brown and has a full-bodied flavor, deep color, and soft moist texture. The color will depend on the amount of molasses added during processing of the sugar. The darker the color the stronger the taste so use the one you like the best. The same weight of brown and white sugars has the same sweetness. Because white sugar is denser than brown sugar, to get equal sweetness firmly pack the brown sugar so when inverted the cup of brown sugar will hold its shape.
Brown sugar has the tendency to lump and become hard.
To avoid this, store in a glass jar or plastic bag in a cool dry place. If is becomes hard, soften it by placing a slice of apple in a plastic bag along with the brown sugar for a few days. You can also sprinkle a few drops of water on it and seal in plastic bag for a few days.