What are the best kinds of cases to protect the iphone?

I'm looking to get a new iphone case but I don't know which kind of case to buy. Rubber, plastic, silicone, etc. Which can best protect the iphone?

Griffin, life proof, otterbox. Otterbox will break easy but they will replace it!

Otterbox and life protector

Silicone is the best~ If you want to buy best iphone cases, you can go to icase-zone. All of them are free shipping.

The silicone cases may more protective as it is shock absorbing and more durable. You can try finding iphone cases on onecase.co.uk. There are also Griffin cases and Otter box cases available for your choice.
http://www.onecase.co.uk/otterbox-defender-case-for-iphone-4s-4-realtree-camo-ap.html
http://www.onecase.co.uk/griffin-survivor-case-for-iphone-4-4s-camo.html

I think the Aluminum case is the best.once I felt my iphone 5 from my lap to the ground when I getting off a car, it was felt so heavily, but with the Aluminum case, it was all ok. The Aluminum case I'm using is bought online on sale, nice price!
you can have a look at the website http://www.luxurycase.co.uk

6 Cool Credit Card Cases for iPhone
http://forum.pandaapp.com/thread/2/8/20121023/50865099eb9806813-1.html