The customization in iOS isn't so much the home screen, but the apps themselves. For one i got some nice retro apps to play videos, music, and turn my iPhone into a retro flip desk clock with alarm...on Android, no such apps exist except widgets, which are great if you stare at the home screen full of them which to me is cluttered. I also prefer iOS's badge notifications over Android's always-full, cluttered with icons status bar. While (limited) badge alerts can be done in Android, they still require the status bar icons for a counter reference or the add-on doesnt work. To keep my status bar iOS like with just the signal, battery, and carrier status means turning off all notifications entirely...there is no full-screen stuff like a full-screen Nixie tube clock or a full-screen retro boombox music player, it's either custom widgets or apps which just don't cut it for me. However, I still like Android in tablets, which excels in gaming and plan to, later on, buy a Galaxy Tab 2 10.1 which has a rather impressive clone of the retina display (anything else gives me eye strain or migraines) and in the demo display was pretty darn fast. For some reason it is $100 cheaper than the Galaxy Tab 1 despite having the same things (16GB, ICS, whatever Google calls the retina display....) which was odd...but for a phone I still prefer the iPhone...
Battery life. Still Android's Achilles heel, only 40 hours per charge. No good.