I am using iphone 6s more than four months there is no problem in using because in iphone RAM is 2Gb I am installing the games and software , mp3 and videos upto 10GB of memory there is no hang up.but comparing to android mobile this same processor hang up in 8GB also .
Because apple have cent effiicency of processor.The main drawback in iphone is memory . here, total phone storage is 16Gb cloud takes 5Gb and ios software takes 1Gb rest we will have 10Gb for usage such as games , app, mp3, video etc., this memory is not enough for permanent storage