Won't let me install Nook cos I am in Israel.
Maybe I when I am in the UK next week it will allow me.
If so, is it better to buy there than on Kindle?
Price seems to be the same.
I can't speak to whether the Kindle editions are better formatted technically or not; all I can tell you is that the Nook editions I've bought of the two most recent Trek books have been formatted properly, and that I'm very pleased with my Nook (not the least because it helps prop up a book-selling business that isn't named Amazon.com).