Which iPhone case should I use?

I have 2 cases, one is a clear plastic one, and the other is a black, metal tortoise case. The plastic one is raised slightly above the screen which is good for if you drop it, and is clear so you can see the back. But the black metal one gives you that nice cool feeling when you pick it up and isn't raised, meaning it doesn't protect the screen in any way. Which one should I use?

A case is used to protect so use the plastic one.

If you want a new iPhone really quick then use the metal one.

When and if it does get (perhaps accidentally! ) by you, it may break and you will have a perfect excuse to get a different phone.