Who I have the same questioned this solution

It's a little bit more than that lol. As far as what the OP is asking...we can't really answer that for you without knowing what your needs are. You can look on Apples website to see the difference in each model to see what better fits what you're interested in. http://www.apple.com/iphone/compare/

Just a few that come to mind immediately: Size is a difference between the 5s and the 6/6s. The 6s has better main and FaceTime cameras than the 6 and 5s. 3D Touch is available with the 6s. For some none of that means much while for others having the latest is always the route they would want to go. Either device is fine.