What is the difference between using Align or using Positioned flutter
Positionedis an offset based alignment which uses DP as unitAlignuse a % of the parent size
As such, Alignment(0.1, 0.1) cannot be represented using a Positioned. And similarly,Align cannot represent a Positioned(top: 10, left: 10).
Secondly, Positioned is on a different flow.
Stack can size itself based on the size of one of its children excluding Positioned widgets.
As such, using an Align vs Positioned can result in Stack taking a different size.
Positioned can only be used within a Stack and positions a child relative to the Stack size.
https://docs.flutter.io/flutter/widgets/Positioned-class.html
Align will be as big as possible within its parent (or a size relative to the children if heightFactor, widthFactor are passed) and positions its child relative to itself. Align can be used everywhere, not only within a Stack.