It depends what its for.
iOS for things like being able to access photos,files and things on a unified synced account. I have always found iOS very easy and simple to use and operate, it a one click system to get things done.
I like Android for the customisations and things you can do with it. Sometimes it is difficult to get something done, but it is do-able. However, its now become more easy to have synced accounts for Andriod, via programs like, DropBox, OneDrive, Mega.nz, Google Drive ETC.
Overal though after using both I do prefer Andriod.