I vote for IOS because I use Iphone. But my experience tell me IOS only work best on Hardware of Apple. Android is the king!
The obvious answer to this question is: It depends what you are using it for ! There are people whose life is run by phone, they are even called the Generation Display, and on the other end there are old farts like me... who use a mobile phone, for making phone calls. occasioanlly listen to music or a audiobook, and use Navigate instead of Google Maps.
I've always wanted to get a Windows Phone with the latest version. It seems very simplistic and yet not locked down as much as iOS. It'd have all the features and probably incredible battery life compared to my Android. Personally, I've only experienced these: iOS 5, 6, 10, 11, 12. Android 2, 3, 4, 5, 6, 7, 8, 9, 10 Some feature phones
Why would you think it’d have great battery life? Running windows on a MacBook drains the battery faster than Mac drains a MacBook
I was speaking about any generic Android device (or my own) versus a Nokia Windows Phone. I've noticed the battery life is much stronger.
I'm hanging on to my 925 and 950xl winphones. I have a feeling there will be some cool stuff to install on them in the future. Though probably more for the 950xl.