UnityEditor.Editor Preview methods vs. UnityEditor.ObjectPreview methods

Both UnityEditor.Editor and UnityEditor.ObjectPreview allow you to create object previews in your custom Inspector, including the same public overridable methods such as:

• bool HasPreviewGUI()

  
  

• void OnPreviewGUI(Rect, GUIStyle)

  
  

• string GetInfoString()

What's the difference?
Is one newer and more recommended than the other?

The only difference for me right now (that I can see) is that keeping my preview code separate from my Editor (inspector) class could be seen as separation of concerns, if I could separate out the two scripts.
Though I might imagine it could be useful to have the context of everything in my Editor (inspector) class when drawing the preview..

Not really sure though which I should use?
Any ideas?