What’s so great about kale?

https://www.eatthis.com/10-superfoods-healthier-than-kale/

https://skipthepie.org/vegetables-and-vegetable-products/kale-raw/compared-to/chard-swiss-raw/

Spinach--Nutrition Score: 86.43
According to the United States Department of Agriculture, a 180 gram serving of boiled spinach provides 6.43 mg of iron, the muscle mineral—that’s more than a 6 oz hamburger patty!

Chard--Nutrition Score: 89.27
Recent research has shown that these powerhouse leaves contain at least 13 different polyphenol antioxidants, including anthocyanins–anti-inflammatory compounds that could offer protection from type 2 diabetes.

Beet greens--Nutrition Score: 87.08
A scant cup of the bitter green serves up nearly 5 grams of fiber—that’s more than you’ll find in a bowl of Quaker oats! Researchers at the University of Leeds found that risk of cardiovascular disease was significantly lower for every 7 grams of fiber consumed.

Watercress--Nutrition Score: 100
The top dog, the unrivaled champion, the chairman of the cutting board, watercress may also be the closest thing yet to a true anti-aging food. Gram for gram this mild-tasting and flowery-looking green contains four times more beta carotene than an apple, and a whopping 238 percent of your daily recommended dose of vitamin K per 100 grams—two compounds that keep skin dewy and youthful.  Richest dietary source of PEITC (phenylethyl isothiocyanate), which research suggests can fight cancer.