I preferred Engle's The Lightning Dreamer to Tropical Secrets. The writing and the story of The Lightning Dreamer was just more interesting to me. But Tropical Secrets was still good (I read it in one sitting). It covered a bit of history I knew nothing about (Jewish refugees in Cuba). I don't know that I'm going to go out and read all I can about Jewish refugees now,* but I'm glad I learned something from the book.
*Though maybe I should. There seem to be a lot of interesting stories out there. Just this year I read both Tropical Secrets and Passage to Freedom: the Sugihara Story.