Being a storyteller, I put a great deal of stock in the clarity and meaning of the words we choose to describe what we are trying to communicate. Meta-storyⓒ is about the "story" and Transmedia is about the "Media."
Meta-storyⓒ – “Meta-story is a narrative created to treat all the different formats and media as a single, seamless storytelling canvas using each expression's unique strengths and abilities. the Meta-storⓒy is the larger story from which all media expressions draw"
Transmedia - "Transmedia storytelling represent a process where integral element of a fiction get dispersed systematically across multiple delivery channels for the purpose of creating a unified and coordinated entertainment experience" (Quote by Henry Jenkin, the father of the Transmedia concept)