What's the difference between the different Rig Types ? (Rigify add-on) I've made a metarig (a ready-to-use skeleton) for a character mesh and I've added some extra bones for the feet (my character has long floppy flippers). For each new bone, I need to assign a "Rig type". To do so, in "Pose Mode", I select my new bone and I go to the "Bone Panel" and I scroll down to "Rigify Type" and "Rig type". Here there is a all variety of usable types of rigs...



My question is: With Rigify, what's the difference between the different types of rigs and in which situations should we choose one specific type of rig instead of another ?
Rig Types are the Properties Collection used by Rigify to identify
  what kind of rig the user is building.


Choice should depend on what controls you want to get for your bones.

Rig types description is in link below.

https://archive.blender.org/wiki/index.php/Extensions:2.6/Py/Scripts/Rigging/Rigify/#Rigify_Rig_Types