Better is relative. There is no overarching winner or leader. It all depends on what you're measuring and what you value. A strategy's strength is often also it's weakness in comparison to an opposite system.
I'm forced to be referring to stock Android, no mods for comparison's sake. This is already an exercise in folly.
market strategy - iOS is only sold by apple (it's strength & weakness) - Android can be distributed by anybody (it's strength & weakness)
interoperability with other products - Apple has full family - Android devices are currently like islands
accessory support - iOS has a great ecosystem - Only leading Android devices might get attention
support - with apple, it's one company - with Android, it's possibly more than one company
community modification - iOS can be jail broken, but officially locked down - Android is far more open
UI flexibility - IOS is simplicity defined - Android has animated wallpapers, widgets, management
Types of users - iOS is high cost; users spend money in ecosystem - Android is low cost; users may not spend as much money
Restoration options - iOS has find my phone, iCloud backup - Android has backup / restore
Core OS features - iOS is basic, slow evolution potentially due to popularity - Android is replete with solid stock features, advancing fast
Keyboards - iOS has quite nice predictive text - Android has quite nice gesture keyboard with others
Software updates - iOS is updated regularly to most modern devices - Android is updated regularly, but few modern devices
App marketplaces - apple controls everything (S&W) - Google has a more open policy (S&W)
Software / hardware congruency - iOS is in lockstep with devices - Android is all over the map
Ease of use - iOS is simple - Android is becoming far less complex
Multitasking - iOS puts a priority on the front experience - Android operates more like a "classic" machine
Further points - iOS is better at driving fit & finish - Android is better at driving features
Neither one is better for everything - and consumers need both of them to do well to spur a neverending cycle of competition.
My preference is just as irrelevant in this conversation as your preference. The real discussion is in how each platform offers exciting opportunities to consumers.