Originally, I had put the latter on hiatus and the former forward on the production list because I had gotten stumped on where to go in Sombra's mission.
Well, now I've hit a roadblock in Legion of Shadows (go figure) because as I was writing future chapters, it dawned on me that I had no idea where or even how to end the story. Which kind of makes it difficult since, depending on the ending, I would need to re-work some of the chapters in rough draft stage.