Great thread idea, Fluff! You know I'm down!
Hence, for me, I chose, the actual present world. (besides, there would need to be a lot of agreement about the setting, how the world works if it's something that's not a reality)
Finally, I love to create intrigue with banality, without adding any bells or whistles, prolly while I don't like Fantasy or Sci-Fi fiction.
Just my 0.02 cents. Either way, I'm down to participate on whatever the majority agrees on.
Again, great idea!!