Android:
1.) Custom launchers, this is huge for me. With a few key presses I can transform my homecreen from this...
To this...
2.) Compatibility for most file types IE VLC. So VLC is available on both iOS and Android but most files types IE WMV, H.265 play effortlessly either streaming over a local network or saved to the devices internal memory.
3.) KODI: Available for free off of the Playstore, it installs and runs beautifully on Android without root. Side loaded or via jailbreak is required to get KODI working on iOS
4.) Slow motion or timelapse recorded video content. So viewing recorded footage on a Windows PC for example and using VLC, slow motion video plays back as it was recorded, in slow motion. iOS recorded videos don't.
5.) 3rd party apps for Twitter, Facebook, Music etc Apps like Simple or Swipe Pro for Facebook. Highly customizable, at a reduced footprint to the apps they replace. Simple is not the resource hog that Facebook is for example. NRGplayer music app is simply brilliant and every bit as good as Music app on iOS, but better as it has a highly customizable interface and a graphic equalizer, that really enhances and supplements audio playback.
6.) Charging via standard micro usb cable. Self explanatory really.
7.) Broad range of manufacturers to choose from. I loathe Samsung, their crappy mass produced devices full of bloatware and gimmicky software. Fortunately there half a dozen equally capable handsets available and at half the price. Think Lenova Zuk2, Oneplus 3t, xiaomi Mi Max etc etc There's no question Apple's hardware is superbly put together but their asking prices are heavily inflated and model range limiting.
8.) Widgets: self explanatory really. A weather widget, whatsapp widget and NGRplayer widget are really practical and useful and immediately available on my homescreen.
9.) More efficient notification system.
10.) Download content from anywhere. Torrents, file sharing sites etc etc easily done and easily accessible without need for jailbreaking or side loading. Easier getting content onto the device too via a pc and usb cable.