1, kale is a variant of collard greens, while choy sum is a type of cabbage, also called choy sum.

2, kale is bluish in color, and some of the kale will have a white core. The heart of the cabbage, on the other hand, has an overall green color.

3, kale taste crisp slightly bitter, kale contains alkaloids, will have a bitter flavor. Vegetable heart taste soft, tender, sweet.