First thing that is good in iOS devices is and App Store and yes its much better than google play. Google play has lot of crappy apps. App store has much more well designed applications that google play.
Secondly iOS has jailbreak, With jailbreak you can do anything with your phone, download install widgets, tweaks, edit phone themes and lot lot lot of other stuff.
Watch this video if u wanna know more about JB
http://www.youtube.com/watch?v=fZoqW-GEdQM
Thirdly system iOS is only on apple products. That means that only apple can use it. If you look at android you see that over 10000+ phones use it and 80% of them are totally crappy shit*. Phone like LG (And dont fuc* say that phones by LG like this LG Optimus 4X HD is good, NO! Dude hell no. its fucki** crap!). Also apple sexy!