Voice control: Android doesn't have Siri, but there are plenty of voice actions that you can use to have the phone do things for you.
Third-party apps: For the most part, third-party apps look exactly the same on Android as they do on iOS. I tried a number of well-known apps, such as Flipboard, WordPress, Waze, Evernote, Firefox, Skype, Kindle and many others. The only real difference is the screen size: I didn't have to learn any new tricks to use them. Still, there are many iOS-only apps that I miss: great Twitter clients like Twitteriffic, calendar apps like Fantastical, and games like Letterpress.
Syncing content: What helped Apple gain massive superiority in the portable music player sector was as much iTunes as it was the iPod. Everything in the iOS world syncs easily. Not so much with Android: While there are third-party apps that can sync content with a Mac, the default app-Android File Transfer-just lets you access folders; you have to manually drag items to sync them. The free DoubleTwist can sync to some phones over USB, but not mine. (For $5, it can sync over Wi-Fi.)
There are plenty of other tiny points of comparison I could highlight, but the main thing I found, after using the Moto G for a while, is that the differences between iOS and Android won't matter to most people. With an unlocked phone at this price, I wouldn't hesitate to recommend Android to anyone who is not wedded to the Apple ecosystem. Getting used to Android doesn't take long, and it's a mature operating system that does what most people need. I won't be switching any time soon, however; I have too many apps on my iPhone that I'd lose. And there's still no Letterpress for Android.