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Apple says its iPhone will give 8 hours of battery life for LTE browsing and talk (who does that any more?), and 10 hours for video watching. Samsung touts the S4's 2,600mAh removeable battery, but it has a larger screen and even more features to compromise performance. Smart Stay and S Voice both drain the battery more quickly.
Apple claims its A6 chip at 1.3 GHz is powerful, but it won't sacrifice speed for battery life. The S4 will have an octo-core clocked at 1.6GHz or a quad-core 1.9GHz.
With Apple's wireless and LTE, the iPhone is said to support more networks all over the world to "connect at blazing-fast speeds, no matter where you are". The Galaxy 4S promised global 4G LTE networks support, along with super-fast download speeds.