I do like this latest one best. I haven't read any of your story however so I can't comment on how accurate it is. "Can a pony fight destiny?" is a much better 5 words then "Can a heartless pony live?"
Though I will say that the description makes the story seem very grimdark. Perhaps even more grimdark then Fillystrata was. And if I remember correctly you didn't want this story to be any more dark then Lord of the Rings.