Should I use stateless or stateful?

Stateless widget is useful when the part of the user interface you are describing does not depend on anything other than the configuration information and the BuildContext whereas a Stateful widget is useful when the part of the user interface you are describing can change dynamically.

If you are in doubt, then always remember this rule: If a widget changes (the user interacts with it, for example) it’s stateful . However, if a child is reacting to change, the containing parent can still be a Stateless widget if the parent doesn’t react to change.9 Eyl 2018

Stateless widgets are those in which you want to make a UI that does not need to be dynamically changed whenever you update any value bound to it . For example, if you want to make a button whose title doesn’t need to change dynamically, then you can create a separate widget for a button as a Stateless widget.3 Tem 2019