The Samsung Galaxy S5 has boasted strong sales ever since it was released into the market earlier this year, yet a recent study found the Apple iPhone 5S outsold Samsung’s flagship smartphone in May. The market research and analytics firm CounterPoint surveyed 35 different markets throughout the world to determine which smartphones are the most popular (and least popular). According to the firm’s report, the Apple iPhone 5s outsold the Samsung Galaxy S5 by a surprising 40% in May. That’s a shockingly high margin given the fact that May was Samsung’s first full month of sales following the release of its flagship smartphone. Throughout the month of May, Samsung sold approximately 5 million Galaxy S5 units, whereas Apple sold 7 million iPhone 5S units. So, why are consumers choosing the 8-month-old the iPhone 5S over the ultra-powerful Samsung Galaxy S5? Unfortunately, this question wasn’t answered in CounterPoint’s survey, so we’re left to speculate as to the reasoning behind this trend. It’s hard to fathom that consumers would prefer the iPhone 5S over the Galaxy S5 given the hardware spec differences between these two devices. The iPhone 5S’ display is just 4 inches, whereas the Galaxy S5 features a bold 5.1-inch display…