I've tried and own the Otterbox Commuter, Otterbox Defender, Trident Kraken, and Incipio Silicrylic.
Right now the Incipio is on with a Steinheil Ultra Crystal screen protector.
I still love the size and protection of the Defender, but I like to pocket the phone so the smaller case is better for that. The Commuter is junk, total junk. The Kraken is a great case once you remove the built in screen protector, but again it's big so to pocket is hard.