Look, there’s no wrong answer here. You aren't picking a side; you’re picking a mood. Need a comforting, slow-cooked hug that gets better with time? Go collard. Want a quick, fiery, “I’m alive!” moment on your plate? Go mustard.
Both are packed with vitamins, both are dirt cheap, and both deserve a spot in your rotation. The real fun is experimenting. Why not grab both today? Throw them in a pot together and see what happens. Who knows—you might discover your new favorite way to eat your greens. Go ahead, get messy with it.