Chugoku/Kansai Region or Hokkaido during December?

Was planning to stay a full week in Japan this upcoming December, and I'm currently deciding between these two destinations. I'm avoiding the Chubu region and Tokyo as I've already been to those places several times. Therefore, I wanted to go to a region I haven't really explored yet. So here are my plans:

  1. Stay around Osaka and go to Hiroshima + Miyajima Island
  2. Go to Hokkaido instead for that week.

I mainly enjoy nature, museums, and shopping for going to Japan. Feel free to recommend anything that might sound better!

by Unhappy_Function_126