The iOS platform is an intuitive and stable mobile OS that's as powerful as it needs to be and as power-efficient as they come. While the Android 4.2.2 Jelly Bean in the Galaxy S4 is the best one yet, it's a work in progress. A chief contributor to that progress has been Samsung and its excellent TouchWiz Android overlay with all Galaxy phones (except the Nexus S). Among recent innovations, apps work with the camera to track eye movement and pause media playback accordingly. The Galaxy S4 also includes KNOX, a kernel-level BYOD solution with boot protection that works alone or with a company's existing MDM solution to secure corporate data and keep it separate from the personal side. Of course, the Google Play application marketplace still cannot hold a candle to Apple's App Store, but it continues to catch up. The software advantage goes to Apple.