Important Fantasy Worldbuilding Considerations

If we go with an arcane/divine distinction, and please remember that there isn't much reason to do so unless we're writing Dungeons and Dragons fanfiction, and if also we decide our fantasy setting can go ahead and have a magical internet, a defensible decision, I bet the clerics would have it, or if they both do, theirs would be better. Wizards would keep sending each other faxes.