What is the better way to protect your Iphone?

1. To get a tough protective case that is water proof and has a built in screen protector and stuff, or
2. Just to get a really tough case and a shatter proof screen protector?

I want to make my Iphone last as long as possible and be as heavily protected as possible.

I don;t know which option would be more protective.

Because with option 1 i'm geussing the screen protector for it isn't going to shatter proof, i'm not sure, but it will be waterproof.

and option 2 will have a shatter proof screen protector but would not be water proof.

which is better? Which is the better protection?

1. Waterproof is cool for taking pics underwater!

I don't like case at all but I take good care of it