When comparing Galaxy SII vs. Galaxy SIII in January, we marveled at the horsepower in the newer model that was just 0.01 inches thicker. Amazingly, the Galaxy S4 is thinner and lighter than its predecessor while doubling its processing capabilities and cramming HD pixel quantities into its display.
At 5.4 x 2.7 inches, the Galaxy S4 is a half-inch longer and wider than the iPhone 5. But at 0.31 inches thick, it's a mere one hundredth of an inch thicker than iPhone. In other words, both of these beauties are super-thin, which is achieved by combining glass and touch sensitivity in a single layer atop the LCD. The weight difference too is negligible. The Galaxy S4 tips the scale at 4.6 ounces, just 0.65 ounces more than iPhone 5's 3.95 ounces. As to which case will hold up better over time -- Samsung's plastic or Apple's metal -- only time will tell. Either way, protective cases are probably a good idea. Samsung's device is bigger, but it isn't too awkward to hold. Since size is a matter of preference, we call this one a tie.