Natural scrolling is the default on iOS, Android and OS X. Non-natural scrolling is really a historical throwback to the times before touchpads and scrollwheel mice, where it was usual to scroll by dragging the slider with the mouse, rather than dragging the content.
Natural scrolling is the default on iOS, Android and OS X. Non-natural scrolling is really a historical throwback to the times before touchpads and scrollwheel mice, where it was usual to scroll by dragging the slider with the mouse, rather than dragging the content.