The iPhone 5s has been on the market for a while now and remains a perennial best seller around the world. The Amazon Fire Phone is brand new, just in the U.S., and only on AT&T at the moment. Both command a premium price. The iPhone has a bleeding edge 64-bit processor, a great camera, Touch ID fingerprint identity sensor, and apps from every major provider, including Apple, Google, and Amazon. The Fire Phone has even more faux-3D than iOS 7, a hardware shopping system in FireFly, a Mayday button for instant help, and last year's chipsets warmed over. So, which one should you buy?