For me, lag is having to open apps in iOS to get the same info available via widgets on an Android home screen. Same thing for having to access control/notification menus to toggle something that's one-touch on-screen in Android. I'm constantly checking NBA scores on the Gametime app widget. It would drive me nuts to have to open the app every time to do the same in iOS.
...adding, my Moto x 2014 on VZW Lollipop is virtually lag free, with only the occasional home screen re-draw (running Nova launcher).
IOS has widgets now in the notification bar. Accessible from anywhere.