What is the difference between Taskflow return and Parent Action Activity?

If Taskflow return in a bounded taskflow is used then the control returns back to the parent containing the same return name

If Parent action activitiy is used then control returns back to parent and also triggers an action in parent

Taskflow return ref: https://tompeez.wordpress.com/2013/06/18/jdeveloper-navigation-after-return-from-bounded-task-flow/

Parent action activity ref: https://tompeez.wordpress.com/2014/09/25/jdev-12-1-3-using-parent-action-to-navigate-tabs-of-a-afpaneltabbed-from-inside-a-region/