1. I shouldn't have to handle hardware and software integration to get android to offer the best performance. I don't want that job. The phone makers should be doing this, not me.
2. Android is poorly supported by carriers and manufacturers. You'd be lucky to see one major update a year on a brand new device. Apple gave the 3 year old 3GS their current iOS5. Better support is a must, especially when talking two year contracts. No more aggravation from waiting 6 months to a year for an android OS update that will outdated as soon as it is released.
3. The games selection sucks on android. iOS gets all the big budget titles from big name games developers. Also Infinity Blade 2 works on a 3 year old 3GS. Good luck getting Shadowgun to run on your HTC Evo.
4. 95% of android phones are suck-ass horrible laggy messes. iOS is always super smooth and stable so I spend more time enjoying my phone not tweaking or flashing ROMs. There is no such thing as a bad iPhone. There are plenty of horrible android phones.
5. iPhones have a better battery life. More time surfing, gaming, messaging and talking between charges. This makes the iPhone a better lifestyle accommodating device.
6. All the Google ecosystem apps I need on android are also on iOS. (Search, Voice, Maps, Youtube, Gmail, etc etc). This negates my attachment to android devices and makes for an easy iOS transition
7. iOS has greater cohesiveness between apps, OS features and hardware. With android you can tell there is almost zero synergy between apps, hardware and OS. This is true even on Google's own Galaxy Nexus.
8. iOS versions of apps look and flow better than android versions.
9. Android phones retain zero value after a couple of months. 3GS iPhones still command a couple of hundred dollars. For those that upgrade every year, this is a huge iPhone bonus.
10. Fragmentation...Google can't get even get their own Nexus S updated properly, and has recently dumped support for CDMA Nexus phones. I'm not dealing with that crap any longer. Apple would never screw iPhone users like that.
Now this list does not suggest android does nothing right. Not true at all, but these are the main reasons why I dumped android, and probably will not be returning.