I use both platforms. In my experience, it's not that the apps are better, but a lot of them do seem to update faster on IOS. I have apps that I use on both systems, and some will update to a newer, nicer-looking & performing UI on IOS faster as IOS updates. On Android, the same apps takes months to update. Once it updates, it works just as good on Android.
The material design of Android is a major change and I noticed a lot of apps still haven't caught up. IOS 7 was a major UI change but not as much as Android.
I have a password app that tooks months to update in Android. Now the app utilizes the fingerprint scanner. I have the Note 5 and this same app has yet to update and allow me to use the fingerprint scanner. Now that this functionality is built into Android 6.0, hopefully apps will update faster to support it.