Hitler and Stalin: Parallel Lives

The book is well written and well informed (constantly more/better on Stalin than Hitler, constantly going deeper and more into subtleties in the personal level interactions, while the Nazi half stays more into general) but the comparative format (1 Hitler chapter, 1 Stalin and so on) is tiring and distracting. This could have been a good book (on Hitler) and an excellent book (on Stalin), but mixed together it turns mediocre at best.