I am currently developing my first commercial iOS-App and I need a second test device, so I can test iOS 7 on my iPhone 4S and iOS 8 on the iPhone 5/5c/5s.
I know of differences between 4S and 5 with the same iOS version, e.g. deferred location updates - are there such differences for iPhone 5c vs iPhone 5s or can I just take the 5c or even 5 without any worries?