Which iphone case should I get? - 1

I have an Iphone 5 with a otterbox defender. I've dropped it a million times and it hasn't broken. I'm getting tired of how bulky it is so I'm considering the commuter case. Will that protect my phone on concrete, wood floors, etc? I don't want to risk breaking it. What should I do?

Personally I have a spigen slimarmor case on my Galaxy Note 3, I dropped my phone down a whole flight of stairs and nothing happened.