Otterbox Defender. Although I don't like them too much, prefer them over Lifeproof. But I like Griffin Survivor. Looks better. Looks very protective too.
Lifeproof. The Defender is just too thick. The new Commuter I am currently using is thick as well. A nice case, but huge. Was watching my daughter run the State XC meet yesterday in the rain and wished I had a lifeproof.