I want to write a book (it will certainly published as PDF / epub for free), I have the ideas already, but I can't decide which OS to use as a base 
Dear readers, which operating system should I use for my book? It matters a lot because the content will be heavily dependent on the OS.
@solene That depends - what will the book be about, and what's the intended audience? I'm a big fan of (the ideas behind) NixOS personally, but it's also still not in a place where I could recommend it universally, it'd depend a lot on the context.
