While I fine tune my first novel, which I assumed would be ready to launch, weeks ago, I have tossed around the idea of which way to go first. In terms of publishing the book as an  E-book or paperback. I am aware that the ratio is about 50/50 now, as far as how people read books, but while I commute to work on a daily basis, I am shocked to discover on some days, everyone on the train reading an actual book and other days, everyone is e-booking. And this is in a city like San Francisco, where we are green on everything we do. So, how do I decide which button to click to submit the style I want my book to be public?  Any thoughts?