Eh, Android really doesn't back up user-data very well...it will backup your contacts, calendar, bookmarks, photos, your background, etc.. and it will automatically re install your apps but it won't back up those app's data. Some app developers do enable the feature to backup your content either through google automatically or data is tied to their own services but if not you'll end up losing some data.
edit: I forget - You can do a full backup and store it on your computer too.
The benefit of Android however is you can store your documents on Google Drive. You get upto 15gb to use vs 5gb too. iCloud has too many limitations as to what file types can be stored there.
There are however, easy backup solutions available too should you store them locally instead. I do the later and won't lose any data as that folder is part of my back up.
----------
[*]The App Store - WAY more apps than Android. Yes, you can usually find "an" app for Android that will do what you want, but many, many more developers release on iOS than on Android - and the quality of apps available shows it.
[*]Integration with iTunes - if you keep your music and/or videos on iTunes, syncing is painless (and soon wireless, with iOS 5). iPhone was my first Apple product - I now also have two Apple TV's and an iPad, and I love the fact that I can get at my media from any device.
[*]Battery life - no Android phone comes close
[*]iCloud synchronization - this is going to be a MAJOR game-changer in iOS 5 (due for release next month
[/LIST]
Have yet to not find an app I have from my many many years of iOS that isn't on Google Play. Not just similar, the same. They are there. Back in 2010 perhaps not but today, they aren't that different.
In terms of iTunes, iSnycr allows my Note 3 to do everything just fine including wireless syncing without issue.
Battery life...Note 3 > iPhone hands down. I'm spoiled.
iCloud doesn't come close to what Android offers with Google Google+ and Google Drive. That's the major game changer between the two.