Turnip greens won, hands down. More interesting taste, nicer texture.
Kohlrabi greens au naturel don’t taste very good. My guess is that they would taste much better in a curry or stir-fry.
The kohlrabi greens tasted better once they were tossed with a makeshift spicy peanut sauce (hot sauce, balsamic vinegar, soy sauce and peanut butter)