Simply IOS better than android bcz it has lot of security than android battery optimization is too good in ios bcz app was not running in background but in android google server is huge so it always sync our data sec to sec so battery draining quickly.and apps are always running in background even after closing app thats the drawback in android.Even 3gb or 4gb ram mobiles have only 1gb free space left for us due to systems apps are always takes more ram.If anyone like this reply plz upvote and follow @sarma