We start by comparing processing power of U.S. models. The Galaxy S4 contains slightly better innards than the iPhone 5. Galaxy's Adreno 320, the successor to Qualcomm's Adreno 225 that it says delivers up to four times the performance and is optimized for HTML5 and 3-D software. The A6 touts the PowerVR that Apple says doubles the application and graphics performance of the iPhone 4. Both phones are capable of 1080p media capture and playback at full frame rates, and both are available with 16 GB, 32 GB and 64 GB of memory for app and data storage, though Galaxy can add 64 GB via microSD. Without benchmarks, it's hard to pick a winner here. We'd call the GPU category a tie.