What makes them different?
Max Heindel is THE URANIAN astrologer. His book is excellent, not an easy read, but good in reference. His book does have a lot of medical astrology. He does work with midpoints, but for midpoints, you may want to look at a good gem which is a recent book by Don McBroom called Midpoints I think. If you like Zain, and Leo stuff you will like Heindel.