@TheAESTHETIC_Edits Urmmm. *runs away*
I dunno. I honestly can't decide. There's too much choice. It kinda depends if you have an idea of waht ur book is about, I think.
Both types have a lot of potential, but if you held me at gunpoint and told me to decide, I'd pick modern, I think.
But, if you do it right, you could also make a good fanfic with the original stuff.
It just depends on your story idea and what fits well and stuff.
But, I dunno because I suck at decision making :P