A cool thing I miss from iOS was the ability to play only the audio of the video with the toggles found on the lockscreen using the double press on the home button. Playing the video and listening only to the audio while the screen is off can be really good for music videos and comedy standups. And also double tap on the status bar to go back to the top.
Android isn't always consistent with its navigation and UI schemes. And Android updates are never really the same or released around the same time. Sometimes some apps won't work for each update or each custom skin/ROM. MoboPlayer's mini-player, DynamicNotifications, and Greeenify doesn't really work for MIUI. It takes time to get used to each Android flavor's quirks.
Still I would rather have a few tradeoffs if both Androids can use QuickPic, Nova Prime, All in One Gestures, ES File Explorer, App Backup & Restore, Screen Off & Lock, TubeMate, hide apps/clutter, do shortcuts, do OTG, be read as a mass storage, have a BACK action instead of only a HOME action, Bluetooth transfer, and so on and so on...
I used to love iPhones. I remember the day they announced it and my jaw dropped when I saw the photo of the iPhone showing Cover Flow. I remember downloading the commercials with Orba Squara's "Perfect Timing" and looping them on my PSP. I used to have Intelliscreen back when I was on 1.1.4. I followed both iOS and Android during the beginning. I still do LOVE iPhone's hardware. It is iOS that I am no longer in love with. Too crippling, linear patterns, and restrictive in some of the most BASIC actions.