Lifeproof vs Defender vs vapor pro for iphone 4?

I'm trying to decide on a case but i'm having issues figuring out which one to get. I've heard that the lifeproof muffles your speakers and makes the screen hard to use, but i enjoy the look of it. The defender has a nice screen protector and is very resistant, but the silicone stretches a lot over time. The vapor pro seems to be reliable, especially with the carbon fiber back. The only issue i see is that there's no screen protector. I'd love to know which one is the most reliable and convenient. Please ignore the price, i just want to know which is the best to have for protection, mainly dirt and dropping it.

I'm a big fan of the LifeProof cases. I've had them on my iPhone 4's and now the 5. My whole family is protected and I love the freedom of being able to take my phone anywhere without concern. Being able to wash it is nice too so it does not carry germs. I use it as an underwater camera on vacations and (guilty pleasure) listen to music in the shower. The touch is sensitive on mine - especially the iPhone 5. Anything with a screen protector will alter the touch experience, so this is something to keep in mind. The otter box is big and bulky and rubbery but does not protect against dirt, water, or melting snow, although It is ok for shock. It was my first tough case. After putting Lifeproof on my phones (and now iPad) I have never looked back. You will love it. Just don't buy from eBay or cheap online sellers (I made that mistake once - horrible fake) as most of those are counterfeit. Buy from LifeProof direct or a major chain store and you will get the genuine article.