The Nexus 5 and iPhone 5S are two smartphones that are very clearly at the top of their game. The Nexus 5 brings you all of the latest and greatest technology, a huge 5-inch screen, and costs just $350 off-contract. The iPhone 5S is a sleek, light, beautifully designed phone with class-leading performance and battery life -- but in true Apple fashion, it misses some newer technologies, such as NFC and 802.11ac. Which one should you choose?