What's the best waterproof case for the Samsung S4: Lifeproof Nuud, Lifeproof Fre or the Otterbox?

[AC Question]

I tend to place my phone in my back packet so bulkiness may be a problem. I have 3 year old twin girls who love to play with my phone with that being said I want to be able to protect my phone as much as possible without affecting the sound or performance quality. Any recommendations would be helpful