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It's iTunes with 800,000 apps, which Galaxy S4 can't match.
Apple's got its iOS 6 and the Apple core, along with its many features and apps. It touts the speed of upgrades, while Samsung has Android 4.2.2 Jelly Bean, the most up-to-date version of Android where updates aren't as immediate.
Almost everybody knows Apple's all-purpose Siri, while Samsung introduced its S Galaxy S Voice Drive, which is designed for cars.