I'm not sure it really matters to me which version of the story we do, I guess A would be more plausibly canon-y but I doubt anyone cares about that.
For B, would we be restricted to making gems similar to monsters on the show, or can we just do whatever? (although making gems based on monsters in the show sounds fun.) Would Beach City be involved or would we be staying away from that? Would we be using a lot of locations in the show, like Mask Island or the heaven beetle's temple or whatever?