Is lifeproof case good on iphone 4?

I have a otterbox defender case on my iphone 4, its good but should life proof? Which is more safer?

Otterbox i guess

I tought a lifeproof case is waterproof, isn't it? But I like otterbox defender case ehich is protective, and I'm applying this one, I''d like to share with you here.

I think otterbox defender is better, but you can find more iphone cases here http://www.onecase.co.uk/