I have the iPhone 5c it an ok phone but the only problem I have wit it whenever am talking to my girl or anyone else and it pass an 2 hour it says call fail every single time.my sister has the 5s she said hers doesn't be doing that so am gessing the 5s is better
In my mind you're over paying for both but since you don't care about that you might as well go for the more expensive iPhone 5S. Why? Well, the iPhone 5C has the internals of the iPhone 5. Also, the 5S has a fingerprint reader that's not too bad if you're into that kind of thing and it also has better overall performance.
