After purchasing my new 16gig iPhone 4 and putting a Zagg IS front and back protector on it I decided that I needed more protection so I got a Griffin Survivor and an Otterbox Defender and made some comparisons. The biggest difference I found was that the Survivor didn't have any watermarking issues, where the Defender did. Also, the Survivor port covers fit much tighter, and it seems to offer a tighter fit from it's silicone cover than the Defender. The Survivor has a camera cover and protects the speakers better than the Defender, with the dock port cover protecting the bottom speakers and a clear plastic piece covering the face time camera and ear piece (its got 5 small holes in it so sound still transfers). The sleep wake and volume buttons don't seem to lose any of their feel with either case. The Otterbox has a slightly recessed home button while the Griffin is slightly raised. The silicone is smoother and less sticky on the Griffin case, which makes it easier to get out of a pocket even though the Griffin case is bigger. The belt clip for the Otterbox offers more protection and is a bit more sturdy than the Griffin, but the kickstand on the Griffin seems to work better. Overall I prefer the Griffin case because it doesn't watermark and the kickstand works better, but either case will probably keep your baby nice and safe. One other thing, the Otterbox started to peel up my Zagg protector on the back of my phone, and seemed to put a small circular mark on the front protector. YMMV.