I'll be staying with the iPhone. I've tinkered with and tried several high end Android handsets and they do have a few feature advantages over the iPhone but I always came back for several reasons and won't make the mistake of going to Android again.
1 - Battery life. Every Android I've used had inferior battery life to the iPhone (especially the iPhone 5). I don't want to have to put my phone in airplane mode or remember to turn off a bunch of settings in fear of the battery dying too quickly, nor do I enjoy carrying around an extra battery.
2 - Apps. Android is catching up in the sheer number of apps but I find that many of the apps are either of lower quality or missing features that are found in their iOS counterparts.
3 - Reliability - Even the Android's that I've used that run ICS or Jellybean still aren't quite as smooth as iOS. Though they have come a long way since the mess that was Gingerbread. Everything seems more stable on the iPhone.
4 - Support - With Apple I can walk into a store and get a warranty exchange for my iPhone right on the spot. No going through carriers and waiting for a box in the mail like with other OEMs.
5 - Backup/Restore of data - I like how with iPhones I have always been able to totally back up everything on my iPhone and then when it is restored all my content, messages, settings, media, everything is exactly as it was on the old iPhone.
6 - Media Player - Every media player I tried on my Android phones was inferior to the default one on the iPhone. Google Play Music stuttered or lagged between songs quite a bit more than the iPhone does when playing music.
I personally don't care much for tinkering with my phone and finding third party apps to perform tasks that work out of the box on my iPhone. Buy the new iPhone, restore from backup, and start using. I see how some people like Android more though. It's not for me. I have a computer for when I want to customize things.
I have the 5 and won't get the 5S though. I'm satisfied for now. LTE and battery life were the most important upgrades that made me get a 5.