Which case is better for a iphone?

I have a iPhone 4s and I can't decide what phone case that will will protect my phone from cracking. I have the Defender outterbox which I used all the time and it protects my phone really well and I also have commuter case and I only used it once I really like commuter outter case but I'm scared I'm going to crack my phone if I used that case. So I'm asking from Experience which phone case will be better?

Lifeproof

Both cases are good so go with any one