Should I get the mophie iphone 4s juice pack air or and otterbox defender case?

I can't get the Otterbox iON case because it costs a lot but should I get the mophie case or the otterbox defender. I don't really have use for a otterbox because I never drop my phone. I'm leaning towards the mophie, but i want to know how durable the case is as well as the battery. Thanks in advance!

Added (1). Hey sry about the mishap. Didn't mean to post it at the Travel section.

Why did you post this question under TRAVEL?

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