So u upgraded from iPhone 5 to 5s?
3G 600 MHz (running at 400 MHz), 2mp camera, 128mb ram
Vs 3GS 800mhz(running at 600 MHz). 256mb ram 3mp camera.
If u upgraded to 5s from 5
A6 processor 1gb ram 8mp camera (better low light mp than 4s),
A7 64bit (that has no real use), 1gb ram 8mp camera (auto focus faster, more burst mode f 2.2 than iPhone 5 camera).
iPhone 3G Geekbench Score: 135
iPhone 3GS Geekbench Score: 150
iPhone 5 Geekbench Score: 1296
iPhone 5S Geekbench Score: 2557
The 5->5S is MUCH more substantial than the 3->3GS upgrade in terms of what you get in forms of an update.