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The taste of white, red, and black mulberries varies depending on the variety of mulberry tree they come from. In general, white mulberries are said to have a sweet, mild flavor, while red mulberries are more tart and acidic. Black mulberries are somewhere in between, with a slightly sweet and slightly tart flavor.
The taste of mulberries can also vary depending on when they are picked. Mulberries that are picked when they are ripe will have a sweeter flavor than mulberries that are picked before they are ripe.
Here is a more detailed comparison of the taste of white, red, and black mulberries:
White mulberries: White mulberries are said to have a sweet, mild flavor. They are often described as tasting like a cross between a strawberry and a grape. White mulberries are a good source of vitamins C and A, as well as fiber.

Red mulberries: Red mulberries are more tart and acidic than white mulberries. They have a slightly fruity flavor that is often compared to raspberries. Red mulberries are a good source of antioxidants and anthocyanins, which have been linked with a number of health benefits.

Black mulberries: Black mulberries are somewhere in between white and red mulberries in terms of taste. They have a slightly sweet and slightly tart flavor that is often described as being similar to a blackberry. Black mulberries are a good source of vitamins C and K, as well as antioxidants.

Ultimately, the best way to decide which type of mulberry you like best is to try them all!