Which iPhone should I get the 5s or the 5c?

Which is better?

Well… Let me give you my opinion, 5C does not have some of the same things as the 5S but the same design and similar to the iphone 4. If you want an iphone that is colorful, then the best way is an iphone 5C. But if you want a little "upgrade" then it's best to stick with the 5S.
You can look up differences with apple.com
Hope it works out for you!

Defiantly the iPhone 5s!