Should I get the Commuter or the Defender Otterbox case for iPhone 5?

I used to be an iPhone case whore lol. I buy every case I see on mall stands (which range from a dollar to three dollars, sometimes six), and currently I have 29 iPhone 5 cases. They all look super duper cute, except they never really protect my phone. I feel I wasted so much money on cute phone cases that are useless except for them prettying up my phone.

My friend introduced me to the Otterbox cases, and I don't know which to choose. This time around I'll be sticking with just ONE case, and I want one that will protect my phone (since I often drop it).

The commuter case has good protection but not as good as the defender, defender comes with a built in screen protector and it bulkier. The commuter come with a stick on screen protector and it is for slim than the defender but offers a bit less protection