Currently I am using this phone( iphone 5s) and I am fully satisfied with its features, be it battery life, camera quality is and music with earphones gives you the best earphone expirence and its operating systems allow your phone to be free from all types of malwares and viruses so not to worry about viruses
The only demerit is connectivity with other phones but I am really telling you guys
If you fully charged your iphone 5s then it will be run for whole days( exception: in case you play games and play music or use of internet then it will little shorter life than that but 8 to 9 hours is standard)