ConclusionThe S5 comes out to be a clear winner out here as it is fast, well built, and fully featured. Clearly, it is for those who want high-end technology in a compact slab. It has got a larger and better screen, better keyboard, a good ecosystem, and the tried and the trust of Samsung's famous Galaxy series.
By contrast, the iPhone is smaller, but much easier to operate with one hand and is lighter to carry. Thus, if all you want is simplicity and want to stick with Apple branding then the iPhone 5S is a also a good choice.