I liked the design, its camera performance and its stability.
iPhone 5S is a full package of awesomeness, it just has a few disadvantages like bluetooth pairing with only Apple devices.
Apples market stability and reputation, and the less vulnerability of malwares and virus on iPhones made me choose this product. Its really worth the money. Being 2 years old, its still working without any errors and battery backup is also pretty decent.