In reality? Whatever you want them to be. Just pick which one goes with the image you had in your mind when you went sandy, or whichever you think looks best to you.
Really, you don't want me to get started on this subject *again*. It's been covered many times ad nauseum - just check past threads.
So its like the bars on the ear cover It has " rank" but not a sole knows what, and the rank bars on the ID unifroms where decipher said one thing books say a differnt thing and so on and so on