Our house has two iOS devices (an iPad and and iPod Touch), and two Android devices (Nexus 7 tablet, Samsung Galaxy phone). The Androids are newer than the iOS. So far, I prefer the Android devices for these reasons:

• Android is multi-user. Just swipe down, select a different account. iOS seems designed for individuals living alone.
• Widgets on the home screen. Just by glancing at my Nexus 7’s screen I can check my email, my calendar, and the weather. iOS’s home screen is just a list of all your apps.
• AdBlock Plus. Android has an AdBlock app, which tries to block in-app adverts.
• Internal access – Terminal, Disk usage, RAM usage, etc. I feel more comfortable with a device that gives me that level of knowledge. Android holds it’s users in higher regard than iOS.