I had a 5, for almost a year, got tired of iOS , then switched to the GS4. really liked the big vivid screen and I really liked swype. I like the battery swap out, instead of plugging it in.
I used apex launcher , it was cool , I had an iOS 7 theme with iOS 7 icons lol
I hated the bloat ware, you can't uninstall any of it , unless you root it. (which i think disables it) I just didn't want to mess with rooting. I knew I was going to sell it eventually. I do like hacking, but just didn't feel comfortable doing it.
I just wanted to try android again. I didn't go with the Htc one. probably would have been a different experience. just didn't try it out.
the 5s I have now is so much faster and snappier, I couldn't believe it really. games faster too. and no games crashing. I like the one handed use of the iPhone. I have long fingers, and I kinda had trouble using the S4 one handed. I got used to it though, little awkward though.
I've had an iPhone since the original in '07. and every one after. even though I switched to android sometime after the 3GS , but I Still went back to iOS again.
the camera on the s4 was slow sometimes. didn't focus , then I had to close it and open it again. could've just been me idk.
the screen outside was just not good. it was too dim compared to my husbands 5. not even in direct sunlight, I mean just outside even if it was a cloudy day. that was dissapointing.
I did like the different camera modes on the s4 though. they were cool.
the iPhone screen colors aren't as big and bold and they don't pop as much , but that doesn't bother me. they're 2 totally different screens
I don't really miss the big screen. the pros for the 5s out weigh the pros for the s4. that's just me though.
I just turned off the gimmicky features like eye scrolling etc on the s4. I do kinda miss the battery life though. but it has a bigger battery too :/
I'll always be an apple fan girl. oh and I really like the resale value on iPhones much better than the android devices.
that's my experience in a nut shell since the original iPhone.
I'm a tech person. I'll continue to buy iPhones every year even though my husband doesn't approve sometimes lol

sorry this was kinda long. just wanted to share
