You could combine both and make a video book trailer! I self published 2 years ago and had the same issues about marketing... it's hell, in a way, but after 4 years of writing my book I was pretty determined to sell it. One of the ways was the video book trailer (I'll put a link below) it has had 318 views... does that translate into sales, I'm not really sure.

When I self published I got 300 books printed (ambitious!) and also made a kindle version. The book hasn't really taken off, some people love it, I have good Amazon 5* rating, some friends, not all. I have done book fairs... hard slog. One good offshoot is that I now teach a writing course in an Arts Centre because I actually became obsessed with the writing process as I went along. Turns out I'm pretty good at inspiring other people to write. you gotta go with your heart. If you're a writer, you're a writer, ain't nothing you can do about it. Give in and keep going.