Under Armature in blender I have two options Human (meta rig) and Pitchpoy Human (meta rig) what are the differences between both and which is considered best to put into an other existing mesh I have done in the past. I use BVH motion files on some.
Pitchipoy has face bones so you can more easily make expressions, the standard Human does not. So in answer to your question, The best one depends on what you are doing. If you need to rig and animate the face into expressions, use Pitchipoy, if not, or you are using Shapekeys for the facial expressions, use Human.
Thanks for your time