I have the Case Crown right now that you recommended.
But I just don't feel quite secure with it hence I picked up the LifeProof. Not sure what to do with the case crown afterwards. Maybe just hand it to a co-worker since one of them commented on how light the case is.
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Had my iPhone with the Case Crown in back pocket. When I reached for the iPhone before sitting down, one side of the case slid off (shorter side) and I was standing for a good minute digging for it in my back pocket. Luckily the restaurant was not too full.