Medical student here. I've tried many flashcard programs (StudyBlue, Quizlet, gFlashcard, MentalCase, and more), and Anki is by far the best for my needs.
One thing that puts Anki in an orbital beyond the other programs is the ImageOccusion editor add-on [1]. This lets you screenshot an image, draw rectangles over labels within that image, and then generate a flashcard for each label. This works insanely well for learning anatomy.
I remember about a month ago where I had two hours to learn the names of all the tracts and nuclei inside of the brainstem for a readiness quiz. It took about 10 minutes to create flashcards for them all, and an hour to memorize. I passed the quiz. Days later fellow classmates were still struggling to remember the same information.