Which case is good for iphone5? - 1

I'm looking at the Otterbox defender series vs LifeProof fre case. I found the lifeproof on ebay for only 10.99$! But it has a note that says it isn't the original case. I found the Otterbox on Amazon for 29.99.So which one you recommend to go with, the otterbox or the waterproof?

The link for the waterprood is: http://www.ebay.com/...1045396274" class='ext_link'>http://www.ebay.com/...1045396274

Try the Briefcase. Its way cheaper.