These two scripts, HandDraggable.cs and GestureAction.cs, seem to do very similar things. The MR Academy implements the GestureAction script. What is the difference between these 2 scripts and when would you use one or the other?
HandDraggable.cs is a ready-made component whose task is solely for translation an object in the 3D space.
GestureAction.cs is a component created for the purposes of a tutorial and is not actually a part of the HoloToolkit package.
It defines a custom action - which could be rotation, scale, translation, etc. They are similar because GestureAction.cs uses the using HoloToolkit.Unity.InputModule namespace, of which HandDraggable.cs is a member, and the tasks they accomplish are both started with a manipulation event.