I don't understand how anyone could switch from iOS just to get a bigger screen..
Is putting up with the crappy software and lack of integration into the rest of the Apple ecosystem worth it just to get a bigger screen? Is a slightly bigger screen that important to you?
The customization of Android plus the app availability was also a bonus for me. It's like having a jailbroken iPhone with a larger screen. I'm a Note 3 user so I wouldn't necessarily say "slightly bigger". Plus my Note 3 functions fine with my iPad and Macbook Pro with some slight workarounds. I like both Mobile OS's to be honest, but once I got used to Android and the larger screen I realized there was no going back until Apple was able to accommodate. It looks like now they are willing to accommodate and I'll happily switch back if they do.