Default apps and a few smaller inconveniences mean i still use android.
For example, i like how on iOS you can double tap on your lockscreen and start playing music, EXCEPT unless you recently had a media app open, it will always go for the stock ipod app which i don't like to use as it forces me to use iTunes/iCloud both of which i don't use at all.
Safari may be nice to some, but i cannot use chrome or firefox or another browser with its own enhancements on iOS. It is limited by Apple, and i hate this.
SMS apps, mail apps, all launched as stock ones by the system when clicked on something that offers to launch said apps.
I am not in love with the 5 inch screen on my GS4, but i also don't like the small-ish 4 inch on the iPhone. It is not perfect for me. I do like the moto X a lot, i find it very ergonomic, and almost a sweet spot, but i don't think i will buy it now that i have a GS4, probably buy the second iteration next year.
Notifications. Lock screen notifications on iOS are still the best IMO, but the notification shade is rather unappealing. Android is doing pretty good here, with actionable, swipe-to-dismiss type notifications. I love how i can deal with a reminder for instance without entering the app. Makes me really appreciate the "smart" nature of my smartphone. Apple's visual revamp of notification center didn't win me over.
On screen buttons and a recents key in those. Yeah i am that one guy who hates hardware buttons, and having to double press one is an even bigger no-no for me. I like pressing the recents soft key and having all the apps appear in a much less clunkier fashion that double pressing a hardware button which feels more like double pressing a remote button because it is failing to register on my TV.
Sharing is some what better in android as well IMO. In iOS the "open with" menu results in having the target app creating the copy of the file while in android the intents system allows for a simple sharing of the same file between multiple apps. I just prefer that. Also i don't have to pray that the developer of my app forgot to add a share target or doesn't care, the OS takes care of that for me.
App settings. I was sort of a fan of iOS style single settings page until i realized how much i value changing a setting in one of the apps i am using and keeping on working inside the app instead of unneeded exits and entries, making the process feel more streamlined.