Next year

I want to do an Ironman distance race next year but I can't decide what one to do. Switzerland was lovely last year for the half, but I feel like I would like to see somewhere else now.
I have kind of narrowed it down to Challenge Roth, Ironman Switzerland, Ironman UK or Ironman France.

Help me decide, what do you think would be a good race to do as my first full distance Ironman