Just bought 3 cases for my iPhone 3G S...Which is best?

After a half-year stint with the BlackBerry Bold (just until a model of iPhone that I liked came out), I'm a new, or soon-to-be-new iPhone 3G S owner (preordered first day), and after many hours of searching the internet and watching countless reviews on cases, I decided to buy 3 different cases. I bought the White OtterBox Defender case, the Switcheasy Colors case in White, and a White Power Support silicone case. I tend to like the silicone cases for my phones because of how they protect from drops and I like their feel. Each case provides a different type of protection, from super protective with the OtterBox, to relaxed protection with the Power Support silicone cover. Which of the 3 do you prefer? Why? Let me know so I can choose which to use most often!