Welcome! I love your username.
Your chickens look really cool.
Green eggs, Brown egg, white eggs, and whatever other colors of eggs all have the same about of nutrients. But eggs from the store are a little less nutritious thanks to poorly treated hens.
My family and I love all the different colors of eggs, and we agree they all taste the same, but soooo much better than store-bought. It's funny what people believe though... I've heard some folks (no chicken experience) think green eggs have turned moldy and rotten!
Your Brahmas are so beautiful, best wishes with your breeding ventures!